Abstract
Background:
Many studies have shown that adverse childhood experiences (ACEs) are one of the causes of depressive symptoms in middle-aged and elderly individuals, but the combined impact of ACEs and lifestyle factors on depression has not been fully explored.
Methods:
This study used data from the China Health and Retirement Longitudinal Study (CHARLS) from 2013, 2014, 2015, 2018, and 2020, including 10,835 middle-aged and elderly individuals. A latent variable growth curve model was used to analyze the trends of late-life depression and lifestyle changes. The mediating role of lifestyle in the relationship between ACEs and depression was also assessed.
Results:
ACEs were significantly associated with lower initial lifestyle levels (β = -0.138, P <.001) and higher depression severity (β = 0.253, P <.001). The mediation analysis results showed that the relationship between ACEs and the depression intercept was partially mediated by the initial level of lifestyle (β = 0.021, P <.001), and the relationship between ACEs and the depression slope was entirely mediated by the initial level of lifestyle (β = -0.010, P <.01). Different dimensions of ACEs had varying effects on depression.
Conclusions:
ACEs are associated with the severity of depression, partly due to lower lifestyle levels. Interventions focused on reducing ACEs and improving lifestyle could effectively reduce the incidence of depression in middle-aged and elderly populations.
1 Introduction
With the declining birth rate and increasing life expectancy, global population aging has emerged as a critical public health challenge (1). This trend is particularly pronounced in China, where projections indicate that by 2050, individuals aged ≥ge and ≥nd will reach 400 million and 150 million respectively (2). Such rapid demographic shift necessitates urgent attention to modifiable factors influencing late-life health outcomes (3). As a cornerstone of healthy aging strategies, mental health – particularly late-life depression – demands focused research (4). Depression remains the second leading global cause of disability (5, 6), with elderly populations facing unique vulnerabilities: while incidence rates are lower than younger groups (7), associated suicide rates and health burdens are disproportionately higher (8). Notably, depression in older adults exacerbates social disengagement, functional impairment, and healthcare costs (9–11), making it a priority concern for China’s aging society.
It is widely believed in academia that depression results from the combined influence of biological, psychological, and social factors, with early trauma being the most common and significant trigger (12, 13). In terms of early trauma, childhood adversity is a common pathway leading to long-term social, emotional, and cognitive dysfunctions, including depression (14, 15). Adverse childhood experiences (ACEs), also known as childhood adversity, refer to a series of negative events that occur during childhood, including abuse, neglect, substance abuse, and family dysfunction (16). In addition to the short-term effects on childhood and early adulthood health, some studies suggest that the impact of ACEs can persist into late adulthood and is associated with an increased risk of depression in the elderly population (17, 18). For example, adults with a history of parental substance abuse have a 69% higher risk of depression compared to their peers (19). Young women who have experienced childhood adversity, such as domestic violence, parental mental illness, and alcohol abuse, have a higher risk of depression than those who have not experienced such adversities (20). However, the mechanisms underlying this relationship remain not fully understood.
The life course model emphasizes that ACEs have direct or indirect effects on mental health in adulthood (21, 22). The direct effects arise from the adverse experiences themselves, while the indirect effects suggest that the relationship between ACEs and mental health (such as depression) may be mediated by certain factors, such as lifestyle, cognitive function, and life satisfaction (5, 18). A substantial body of research has shown a significant relationship between ACEs and health behaviors or lifestyles throughout life (23, 24). Lifestyle factors (such as diet, exercise, sleep, and harmful health behaviors) are important determinants of depression (25). This may be related to the fact that physiological stress responses exacerbate impulsivity and promote unhealthy emotional regulation mechanisms (26, 27). For example, ACEs are strongly associated with an increase in risky behaviors, such as eating disorders. Among adult samples seeking surgical treatment for obesity, one-fifth of individuals experienced sexual or physical abuse during childhood, and more than one-third experienced violence (28). However, diet is a key factor in the increased or decreased incidence of depression (29, 30). Anda et al. reported that ACEs are an important factor in the initiation of smoking during adolescence and the continuation of smoking into adulthood (31). A study in Europe also found that physical abuse, emotional neglect, and poor parental relationships have a positive impact on the likelihood of smoking and alcohol abuse in adulthood (24). Nurius et al. suggested that buffering factors for childhood adversity may include lifestyle behaviors, such as physical activity, which can reduce stress levels, improve physiological function, and thereby decrease the risk of depression, leading to better physical and mental health outcomes (26, 32). In summary, lifestyle factors may buffer or exacerbate the impact of ACEs on depression through various pathways.
The distinction between mediating and moderating effects is critical to our theoretical framework. A moderator influences the strength or direction of the relationship between an independent variable (e.g., ACEs) and a dependent variable (e.g., depression), whereas a mediator explains the pathway through which the independent variable affects the dependent variable (33, 34). In this study, we hypothesize lifestyle as a mediator rather than a moderator for two reasons: 1. Pathway-driven perspective: Existing evidence suggests that ACEs may shape health-related behaviors (e.g., smoking, poor diet) as maladaptive coping strategies (24), which in turn contribute to physiological dysregulation (e.g., inflammation, HPA axis dysfunction) and increased depression risk (35, 36). This aligns with a mediation model where lifestyle serves as a mechanism linking early trauma to later mental health outcomes. 2. Temporal precedence: Longitudinal data support the temporal sequence required for mediation: ACEs precede the development of lifestyle patterns, which subsequently influence depression trajectories in later life. In contrast, moderation would imply that lifestyle factors (e.g., exercise) alter the effect of ACEs on depression (e.g., buffering ACEs-related risk only among physically active individuals), a hypothesis less supported by prior life-course studies.
Previous studies have established a link between ACEs and depression, and lifestyle factors may play a key role in this relationship. However, our understanding of the underlying mechanisms remains limited (37), especially in the context of depression trajectories over time. Depression is not a static condition, its severity and progression vary among individuals (38). In addition to public efforts to eliminate the effects of ACEs themselves, it is crucial to understand how childhood adversity influences the initial levels of depression and its developmental trajectory, as well as the role that lifestyle factors may play in this relationship. This understanding is vital for identifying modifiable factors that can be targeted for intervention later in life to mitigate the impact of ACEs across the life course. Therefore, to fill the gap in the literature, this study aims to explore the relationship between ACEs and the development of depression in middle-aged and older adults in China, and to investigate the potential longitudinal mediating role of lifestyle factors in this relationship. The study proposes the following hypotheses: (i) compared to middle-aged and older adults without childhood adversity, those who have experienced adversity will have more severe initial levels of depressive symptoms and a faster progression of depression in late life; (ii) Lifestyle factors play a longitudinal mediating role in the relationship between ACEs and depression; (iii) There are differences in the relationship between different dimensions of childhood adversity and depression.
2 Materials and methods
2.1 Data source
The data for this study comes from the China Health and Retirement Longitudinal Study (CHARLS), which is a study targeting adults aged 45 and above in China. The baseline CHARLS data were collected in 2011, followed by four subsequent follow-up surveys in 2013, 2015, 2018, and 2020. The CHARLS project uses a multi-stage stratified probability sampling method with proportional size, covering 28 provinces in mainland China, 450 villages/community committees, and approximately 10,000 households. It gathers extensive information, including data on residents’ demographics, social characteristics, health status, economic status, family structure, and social activities. The life history module collected in 2014 further includes information on the respondents’ childhood family history, health history, education history, wealth history, and employment history (39). Therefore, CHARLS reflects the overall situation of the middle-aged and elderly population in China and has good national representativeness. The CHARLS project was approved by the Biomedical Ethics Committee of Peking University (IRB00001052-11015), and all participants provided written informed consent. This study was authorized by the CHARLS database.
The five waves of CHARLS data (2013 (Wave 1), 2014(Wave 2), 2015 (Wave 3), 2018 (Wave 4), and 2020 (Wave 5)) were included in this study. Comprehensive information on lifestyle and depression were collected at wave 1, 3, 4, and 5. Demographic characteristics of the participants were collected in the first wave, while ACE information was gathered in the life history module of the second wave. There were a total of 11,859 eligible participants in 2013 (excluding those with missing data on lifestyle, depression, and demographic information (n=6,596)). The exclusion of participants with missing data in baseline variables (2013) was based on two considerations: 1. Missingness in key variables (e.g., lifestyle, depression) at baseline may reflect non-random patterns (e.g., refusal to report sensitive information), and complete-case analysis reduces potential bias from unmeasured confounding. 2. The large proportion of missing data could lead to unstable imputation results if traditional methods (e.g., mean/mode imputation) were applied, whereas advanced multiple imputation would require stronger assumptions about missing data mechanisms. Subsequently, we matched the 2013 data with the life history module data collected in 2014 based on ID, excluding 242 participants aged under 45 and 782 participants with incomplete ACE information. Finally, this study selected a cohort of 10,835 CHARLS participants. To minimize cohort effects, participants with missing data in the subsequent three waves (2015, 2018, and 2020) were included in the analysis. However, data from participants who joined the CHARLS study after 2013 were not included in the analysis. A detailed flow chart of the sample selection process is shown in Figure 1.
Figure 1
Flow chart of the selected participants from the CHARLS.
2.2 Measures
2.2.1 Depression
Depression was measured using the revised version of the Center for Epidemiologic Studies Depression Scale-10 (CESD-10), which is an effective screening tool for depressive symptoms in the middle-aged and elderly population in China (40). The CESD-10 consists of 10 items, each measuring the frequency of a specific type of negative emotion. Responses range from “Rarely or none of the time (<1 day)” to “Most or all of the time (5–7 days),” with scores assigned from 1 to 4. The two positively worded items in the scale (“I feel hopeful about the future” and “I feel happy”) are reverse-scored. The total score ranges from 10 to 40, with higher scores indicating more severe depressive symptoms. In the sample of this study, the CESD-10 demonstrated high internal consistency (Cronbach’s alpha = 0.796) and validity (KMO = 0.880, P <.01).
2.2.2 Lifestyle
We constructed the lifestyle score using five factors: smoking, alcohol consumption, social participation, physical activity, and sleep duration. Each factor was categorized as “Yes” (score = 1) or “No” (score = 0). If the participant had never smoked, the smoking status score was 1, otherwise, it was 0. If the participant had not consumed alcohol in the past year, the alcohol consumption status score was 1, otherwise, it was 0. If the participant had engaged in social activities in the past month (such as socializing with friends, playing mahjong/chess/cards, participating in community clubs, engaging in physical activities, joining other types of clubs, taking part in community-related organizations, volunteering or doing charity work, or attending educational or training courses), each activity was assigned 1 point, otherwise, it was 0. If the participant slept for more than 6 hours at night, the sleep duration score was 1, otherwise, it was 0. If the participant engaged in physical activity for more than 10 minutes per week, the physical activity score was 1, otherwise, it was 0. We combined the scores of these five factors into an overall lifestyle score, ranging from 0 to 15. A higher score indicates a healthier lifestyle (41).
2.2.3 Adverse childhood experiences
The life history module of the 2014 CHARLS study, based on the World Health Organization’s Adverse Childhood Experiences International Questionnaire (ACE-IQ), collected data on the adverse childhood experiences that participants had encountered before the age of 18. We extracted 13 ACEs from the 2014 dataset, with each ACE defined as a binary variable (0 = no, 1 = yes or 0 = good, 1 = bad). Based on the cumulative scoring framework, the responses to each question were summarized to generate the participants’ cumulative ACE score, with a total score ranging from 0 (no ACE exposure) to 13 (exposed to all ACEs) (42). In addition, we used exploratory factor analysis to categorize the 13 ACEs into three distinct dimensions: conventional ACEs (physical abuse, emotional neglect, domestic violence, family crime, family mental illness, family substance abuse, parental divorce/separation), expanded ACEs (unsafe living environment, peer bullying, and poor childhood friendships), and new ACEs (early parental death, early sibling death, and parental disability) (43). Similarly, the responses to each item were scored using the cumulative scoring method to generate the cumulative ACEs score for each dimension. The detailed definitions of the ACEs indicators can be found in Supplementary material Table 1.
2.2.4 Covariate information
Demographic characteristics of the 10,835 respondents who participated in the study from 2013 to 2020 were analyzed. The demographic variables measured at baseline (2013) included age, gender (0 = female, 1 = male), marital status (0 = unmarried/divorced/separated/widowed, 1 = married/cohabiting), ethnicity (0 = other, 1 = Han), official household registration status in China (0 = non-agricultural, 1 = agricultural), educational level (0 = illiterate, 1 = primary school or below, 2 = middle school/technical secondary school, 3 = high school or above), and birthplace (0 = urban, 1 = rural). These covariate variables were included in our research model.
2.2.5 Statistical analysis
Descriptive statistical analysis of the characteristics of the study sample was conducted using IBM SPSS version 25.0. Continuous variables were represented by mean and standard deviation, while categorical variables were represented by frequency and percentage. Latent Growth Curve Modeling (LGCM) was used to capture the trajectories of changes in respondents’ depression and lifestyle scores, where the intercept factor (I) represented the initial level of both indicators at baseline (2013), and the slope factor (S) represented the rate of change in both indicators over the four observation periods. Finally, we used LGCM to analyze the mediation effect, which provided the mean estimates of the intercept and slope factors as fixed effects. We addressed this research question in two steps. First, we examined the direct relationship between the ACE total score/dimensions and the development of depression while controlling for a set of covariates (e.g., age, gender, education level, etc.) in Model 1. Then, we added lifestyle factors to Model 1 to test the mediation hypothesis of the study (Model 2). The goodness of fit of the model was assessed using the following indicators: Tucker-Lewis index(TLI), comparative fit index (CFI) > 0.9, root mean square error of approximation (RMSEA) < 0.07, standardized root mean square residual (SRMR) < 0.05, and chi-square test (χ2). Due to the large sample size in the study, the χ2 result was not ideal. All mediation analyses were conducted using the Mplus 8.0 statistical software. Missing values were handled using Full Information Maximum Likelihood (FIML) estimation, which allows for model parameters to be estimated based on all available data. Robust maximum likelihood estimator was provided when the data are non-normality and missing at random. The indirect effects were estimated based on 10,000 bootstrap samples of the maximum likelihood estimation.
3 Results
3.1 Descriptive statistics
The statistical characteristics of the study sample are presented in Table 1. The average age of the respondents was 59.25 years, 53.68% of the respondents were female, 89.53% were married. Notably, the sample exhibited distinct sociodemographic patterns: 91.83% of participants were born in rural villages, and 79.31% held agricultural household registration (hukou). Education levels were relatively low, with 23.22% being illiterate, 44.37% attaining primary school or below, 23.17% completing junior high school/technical secondary school, and only 9.24% achieving senior high school or higher education. This educational distribution suggests potential socioeconomic vulnerability that may contextualize subsequent lifestyle behaviors and mental health outcomes. The average CESD-10 scores in 2013, 2015, 2018, and 2020 were 17.86, 18.10, 18.93, and 19.29, respectively. The average lifestyle scores were 3.22, 3.33, 3.65, and 3.87, indicating that the respondents’ lifestyle gradually improved over time, while depressive symptoms progressively worsened. In addition, the average ACE score was 1.93 (SD = 1.53), with 28.88% of respondents having experienced physical abuse, 30.13% having had poor childhood friendships, and 26.28% having experienced emotional neglect within the family. More details about ACEs of respondents are shown in Table 1 and Supplementary material Figure 1.
Table 1
| Variables | Levels | Observed N (%) | Mean (SD) | Minimum | Maximum | Missing N (%) |
|---|---|---|---|---|---|---|
| ACEs | scores | 1.93 (1.53) | 0 | 10 | ||
| Conventional ACEs (0-7) | scores | 0.84 (0.91) | 0 | 5 | ||
| Physical abuse | yes | 3,129 (28.88) | ||||
| Emotional neglect | yes | 2,847 (26.28) | ||||
| Domestic violence | yes | 941 (8.68) | ||||
| Family crime | yes | 39 (0.36) | ||||
| Mental illness in the family | yes | 1,371 (12.65) | ||||
| Household Substance Abuse | yes | 750 (6.92) | ||||
| Parents divorced or separated | yes | 80 (0.74) | ||||
| Expanded ACEs (0-3) | scores | 0.54 (0.70) | 0 | 3 | ||
| Unsafe living conditions | yes | 881 (8.13) | ||||
| Peer bullying | yes | 1,751 (16.16) | ||||
| Bad friendship experiences | yes | 3,265 (30.13) | ||||
| New ACEs (0-3) | scores | 0.54 (0.70) | 0 | 3 | ||
| Parental death before age 17 | yes | 1,832 (16.91) | ||||
| Death of a sibling before age 17 | yes | 1,795 (16.57) | ||||
| Parental disability | yes | 2,297 (21.20) | ||||
| Depression (10-40) | ||||||
| w2013 | 17.86 (5.77) | 10 | 40 | |||
| w2015 | 18.10 (6.46) | 10 | 40 | 631 (5.82) | ||
| w2018 | 18.93 (6.65) | 10 | 40 | 566 (5.22) | ||
| w2020 | 19.29 (6.60) | 10 | 40 | 1448 (13.36) | ||
| Lifestyle (0-15) | ||||||
| w2013 | 3.22 (1.48) | 0 | 13 | |||
| w2015 | 3.33 (1.53) | 0 | 12 | 631 (5.82) | ||
| w2018 | 3.65 (1.47) | 0 | 12 | 566 (5.22) | ||
| w2020 | 3.87 (1.49) | 0 | 11 | 1448 (13.36) | ||
| Demographic characteristics | ||||||
| Age (45-103) | 59.25 (8.76) | 45 | 103 | |||
| Gender | ||||||
| Male | 5,019 (46.32) | |||||
| Female | 5,816 (53.68) | |||||
| Married | 9,701 (89.53) | |||||
| Education | ||||||
| Illiterate | 2,516 (23.22) | |||||
| Primary school and below | 4,807 (44.37) | |||||
| Junior high school | 2,511 (23.17) | |||||
| Senior high school and above | 1,001 (9.24) | |||||
| Han nationality | 10,049 (92.75) | |||||
| Current agricultural hukou status | 8,593 (79.31) | |||||
| Born in rural village | 9,950 (91.83) | |||||
Descriptive characteristic of participants.
Sample N =10,835. ACEs, Adverse Childhood Experiences.
3.2 The growth trajectories of depression and lifestyle
The unconditional LGCM model for depression scores and lifestyle scores demonstrated good fit: χ2/df =6.88, CFI=0.995, TLI=0.993, RMSEA=0.023, SRMR=0.017. The average intercept (baseline) of the depression scores was 17.837 (P <.001), and the average slope (change) was 0.192 (P <.001), indicating that with the passage of time, the depression score increased by 0.192 in each wave. The average estimated score for lifestyle (intercept) was 3.216 (P <.001), and the average score for the slope (change) was 0.081 (P <.001), indicating that with the passage of time, the lifestyle score increased by 0.081 in each wave. The above results indicate that depressive symptoms in middle-aged and elderly individuals in China tend to worsen with age, while lifestyle improves gradually with increasing age. More details about unconditional LGCM are presented in Supplementary material Table 2.
3.3 Direct association between ACEs and depression
After adjusting for the demographic characteristics of the respondents (age, gender, marital status, education level, ethnicity, birthplace, etc.), the direct association between ACEs and depressive symptoms is presented in Table 2 (Model 1) and Figure 2. The results indicated that, compared to individuals who had not experienced childhood adversity, those with more adverse experiences had higher baseline depression levels (β = 0.277, P <.001). However, ACEs were not associated with the slope (rate of change) of depression symptoms (β = -0.030, P = 0.112).
Table 2
| Variables | Model 1: Direct effect | Model 2: Indirect effect | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Intercept | Slope | Intercept | Slope | |||||||||
| β | SE | R2 | β | SE | R2 | β | SE | R2 | β | SE | R2 | |
| ACEs | 0.277*** | 0.011 | 0.136 | -0.030 | 0.019 | 0.017 | 0.253*** | 0.013 | 0.152 | -0.005 | 0.023 | 0.142 |
| Lifestyle i | -0.150*** | 0.014 | 0.073** | 0.024 | ||||||||
| Lifestyle s | 0.072* | 0.034 | -0.353*** | 0.062 | ||||||||
| A | 0.179*** | 0.011 | 0.092 | -0.027 | 0.019 | 0.017 | 0.159*** | 0.013 | 0.114 | -0.002 | 0.022 | 0.142 |
| Lifestyle i | -0.166*** | 0.014 | 0.073** | 0.024 | ||||||||
| Lifestyle s | 0.079* | 0.035 | -0.354*** | 0.062 | ||||||||
| B | 0.227*** | 0.011 | 0.111 | 0.005 | 0.019 | 0.016 | 0.207*** | 0.013 | 0.131 | 0.028 | 0.024 | 0.141 |
| Lifestyle i | -0.158*** | 0.014 | 0.076** | 0.002 | ||||||||
| Lifestyle s | 0.076* | 0.024 | -0.353*** | 0.062 | ||||||||
| C | 0.136*** | 0.011 | 0.079 | -0.033 | 0.019 | 0.017 | 0.127*** | 0.012 | 0.105 | -0.034 | 0.022 | 0.145 |
| Lifestyle i | -0.174*** | 0.014 | 0.073** | 0.024 | ||||||||
| Lifestyle s | 0.089* | 0.036 | -0.357*** | 0.063 | ||||||||
| Fit indices | ACEs | A | B | C | ACEs | A | B | C | ||||
| X2(df) | 66.76(11) | 65.35(11) | 64.82(11) | 69.54(11) | 523.26(33) | 558.81(33) | 521.40(33) | 559.09(33) | ||||
| RMSEA | 0.022 | 0.021 | 0.021 | 0.022 | 0.037 | 0.038 | 0.037 | 0.038 | ||||
| CFI | 0.996 | 0.996 | 0.996 | 0.996 | 0.981 | 0.979 | 0.981 | 0.979 | ||||
| TLI | 0.994 | 0.994 | 0.994 | 0.993 | 0.975 | 0.973 | 0.975 | 0.972 | ||||
| SRMR | 0.021 | 0.020 | 0.020 | 0.021 | 0.039 | 0.042 | 0.039 | 0.042 | ||||
Latent growth model on ACEs (total score and dimensions), lifestyle, and depression.
ACEs, Adverse Childhood Experiences. A, Conventional adverse childhood experiences; B, Expanded adverse childhood experiences; C, New adverse childhood experiences. CFI, comparative fit index. TLI, Tucker-Lewis index. RMSEA, root mean square error of approximation. SRMR, standardized root mean residual. ***P<.001, **P<.01, *P<.05.
Figure 2
Direct association between ACEs/ACEs dimensions and depression. Note: solid arrow estimates in the model are statistically significant at the 95% significance level, and dotted arrows are not (see Table 2 Model 1). iDep, Depression intercept; sDep, Depression slope. ACEs, Adverse Childhood Experience; (A) Conventional adverse childhood experiences; (B), Expanded adverse childhood experiences; (C), New adverse childhood experiences. Model: adjusted for demographic characteristic (age, gender, marital status, etc). ***P<.001.
The results of the direct associations between ACEs dimensions and depression indicated that conventional ACEs (abuse, neglect, domestic violence), expanded ACEs (unsafe living environments, bullying, poor friendship experiences), and new ACEs (parental death, sibling death, and parental disability) were all positively correlated with the initial level (intercept) of depression (β = 0.179, 0.227, and 0.136, P <.001), but were not associated with the slope (rate of change) of depression symptoms.
3.4 Indirect association between ACEs and depression through lifestyle factors
The indirect association between ACEs and depression is shown in Table 2 (Model 2) and Figure 3 after adjustment for demographic characteristics (age, gender, marital status, education level, ethnicity, birthplace, etc.) of participants. The results indicated that ACEs were positively correlated with the initial level of depression (β = 0.253, P <.001) and negatively correlated with the initial level of lifestyle (β = -0.138, P <.001). The initial level of lifestyle was negatively correlated with the depression intercept (β = -0.150, P <.001) and positively correlated with the depression slope (β = 0.073, P <.01). The slope of lifestyle was positively correlated with the depression intercept (β = 0.072, P <.05) and negatively correlated with the depression slope (β = -0.353, P <.001).
Figure 3
Indirect association between ACEs/ACEs dimensions and depression. Note: solid arrow estimates in the model are statistically significant at the 95% significance level, and dotted arrows are not (see Table 2 Model 2). iDep, Depression intercept. sDep, Depression slope. ACEs, Adverse Childhood Experience. (A), Conventional adverse childhood experiences. (B), Expanded adverse childhood experiences. (C), New adverse childhood experiences. Model: adjusted for demographic characteristic (age, gender, marital status, etc). ***P<.001, **P<.01, *P<.05.
As for the dimensions of ACEs, conventional ACEs were positively correlated with the depression intercept (β = 0.159, P <.001) and negatively correlated with the lifestyle intercept (β = -0.087, P <.001). Expanded ACEs were positively correlated with the depression intercept (β = 0.207, P <.001) and negatively correlated with the lifestyle intercept (β = -0.127, P <.001). New ACEs were positively correlated with the depression intercept (β = 0.127, P <.001) and negatively correlated with the lifestyle intercept (β = -0.059, P <.001). More details can be found in Table 2 (Model 2) and Figure 3. In summary, the findings suggest that the lifestyle intercept mediated the relationship between ACEs and depression (both intercept and slope).
The direct and indirect effects of ACEs on depression are shown in Table 3 (results from Table 2, Model 2). The total association between ACEs and baseline depression severity was 0.277 (P <.001). The indirect effect of ACEs on baseline depression severity through the lifestyle intercept was 0.021 (P <.001), accounting for 7.5% of the total effect (= 0.021/0.277). The direct effect of ACEs on baseline depression severity was 0.253 (P <.001), accounting for 91.3% of the total effect (= 0.253/0.277). The indirect effect of ACEs on the depression slope through the baseline lifestyle was -0.010 (P <.01), and no direct effect was found between ACEs and the depression slope.
Table 3
| Effect | Intercept | Slope | ||||
|---|---|---|---|---|---|---|
| β | SE | 95% CI | β | SE | 95% CI | |
| Direct effect | ||||||
| ACEs-Dep | 0.253*** | 0.013 | 0.228 to 0.278 | -0.005 | 0.023 | -0.051 to 0.039 |
| A-Dep | 0.159*** | 0.013 | 0.134 to 0.184 | -0.002 | 0.022 | -0.046 to 0.040 |
| B-Dep | 0.207*** | 0.013 | 0.181 to 0.232 | 0.028 | 0.024 | -0.018 to 0.074 |
| C-Dep | 0.127*** | 0.012 | 0.103 to 0.150 | -0.034 | 0.022 | -0.077 to 0.009 |
| Indirect effect | ||||||
| ACEs-iLifestyle-Dep | 0.021*** | 0.003 | 0.016 to 0.026 | -0.010** | 0.003 | -0.017 to -0.004 |
| ACEs-sLifestyle-Dep | 0.003 | 0.003 | 0.000 to 0.012 | -0.017 | 0.012 | -0.043 to 0.003 |
| A-iLifestyle-Dep | 0.014*** | 0.002 | 0.010 to 0.019 | -0.006** | 0.002 | -0.011 to -0.002 |
| A-sLifestyle-Dep | 0.004 | 0.003 | 0.000 to 0.014 | -0.020 | 0.012 | -0.048 to 0.000 |
| B-iLifestyle-Dep | 0.020*** | 0.003 | 0.015 to 0.026 | -0.010** | 0.003 | -0.016 to -0.004 |
| B-sLifestyle-Dep | 0.003 | 0.003 | -0.001 to 0.011 | -0.014 | 0.012 | -0.039 to 0.005 |
| C-iLifestyle-Dep | 0.010*** | 0.002 | 0.006 to 0.015 | -0.004* | 0.002 | -0.008 to -0.002 |
| C-sLifestyle-Dep | -0.001 | 0.003 | -0.008 to 0.004 | 0.004 | 0.011 | -0.017 to 0.027 |
Direct and indirect effects of ACEs (total score and dimensions) on depression in later life.
ACEs, Adverse Childhood Experiences. A, Conventional adverse childhood experiences; B, Expanded adverse childhood experiences; C, New adverse childhood experiences. Dep, Depression. iLifestyle, Lifestyle intercept. sLifestyle, Lifestyle slope. ***P<.001, **P<.01, *P<.05.
The indirect association of conventional ACEs with the depression intercept through baseline lifestyle was 0.014 (P <.001), accounting for 7.8% of the total effect (= 0.014/0.178), and the indirect association with the depression slope was -0.006 (P <.01), accounting for 21.4% of the total effect (=-0.006/-0.028). The direct effect of conventional ACEs on the depression intercept was 0.159 (P <.001). Similarly, For expanded ACEs, baseline lifestyle mediated 8.6% of the total effect on depression intercept (= 0.020/0.230). New ACEs showed smaller but significant mediation proportions, with lifestyle explaining 7.3% of the intercept effect (=0.010/0.136). Notably, expanded ACEs demonstrated the strongest mediation through lifestyle factors, with proportion mediated exceeding conventional ACEs by 0.8 percentage points (8.6% vs. 7.8%) and new ACEs by 1.3 percentage points (8.6% vs. 7.3%) in depression intercept effects.
4 Discussion
Although an increasing number of studies have explored the link between ACEs and depression, most of the findings come from Western countries, and relatively few studies have examined the longitudinal relationship between ACEs and depression in middle-aged and elderly individuals in non-Western countries, particularly focusing on the mediating role of lifestyle factors. To our knowledge, this is the first study using longitudinal data from a large national representative cohort to explore the mediating effect of lifestyle in the relationship between ACEs and depression. Our findings reveal several important insights into the complex relationship between early-life adversity, lifestyle, and depression trajectories over time.
First, the observed age-related increase in depressive symptoms coupled with improvements in lifestyle factors presents an intriguing paradox. While the worsening of depressive symptoms aligns with previous research on life course theory (44), the concurrent improvement in lifestyle factors may reflect increased health awareness or access to healthcare services among older adults in China (45, 46). However, these trends should be interpreted cautiously in light of potential methodological influences. First, cohort effects may partially explain the observed patterns: younger participants entering older age groups during the study period (2013-2020) may have been exposed to different socioeconomic conditions (e.g., rapid urbanization, healthcare reforms) compared to older cohorts, potentially confounding age-related trajectories. Second, survivor bias could play a role, as individuals with severe depression or unhealthy lifestyles may have been more likely to drop out of the study or die before subsequent waves, leading to an overestimation of lifestyle improvements and underestimation of depressive symptom severity in later waves. This finding suggests that merely improving lifestyle may be insufficient to counteract the age-related increase in depressive symptoms, highlighting the need for more comprehensive mental health interventions in this population.
Second, we found that individuals with more ACEs had higher baseline levels of depressive symptoms, which is consistent with the extensive literature documenting the long-term mental health consequences of childhood adversity (5, 18). The quality of parental care, cognitive stimulation, and socioeconomic status during early child development have been shown to affect brain morphology and functionality throughout the life course (47). Some studies on the neurophysiological mechanisms between childhood adversity and psychopathology suggest that ACEs may increase the neurobiological sensitivity to stress, thereby increasing the risk of developing depression (48–50). However, ACEs were not associated with the rate of change in depressive symptoms over time, suggesting that while early-life adversity may establish a higher baseline risk for depression, it does not necessarily accelerate the progression of depressive symptoms in later life. This pattern may reflect psychological adaptation mechanisms in later adulthood. For example, older adults with ACEs may develop compensatory coping strategies (e.g., emotion regulation, social support-seeking) over time to mitigate the ongoing impact of early trauma on mental health decline (51). This finding partially supports our research hypothesis 1.
Finally, through mediation analysis, we found that ACEs were associated with poorer baseline lifestyle levels, which, in turn, were linked to higher baseline depressive symptoms. This finding emphasizes that lifestyle is a modifiable pathway through which early life adversity may affect later mental health outcomes. Furthermore, the indirect effect of ACEs on the slope of depressive symptoms through lifestyle factors suggests that improvement in lifestyle may help mitigate the progression of depressive symptoms over time. This underscores the potential value of lifestyle interventions, particularly for individuals with a history of childhood adversity.
Notably, in terms of the ACEs dimension, the expanded ACEs (unsafe living environment, peer bullying, and poor childhood friendships) exhibited the strongest mediating effect. This finding suggests that adversities related to social and environmental factors during childhood may have a particularly strong influence on lifestyle behaviors and, consequently, mental health outcomes in later life. This is consistent with Samaah’s findings on the childhood social living environment and activity behaviors of children across 12 countries worldwide (52). In contrast, conventional ACEs and new ACEs showed smaller but still significant mediating effects. This differences highlight the importance of considering the specific nature of childhood adversities when examining their long-term consequences and designing targeted interventions.
4.1 Implication for practice and policy
Our findings have important implications for clinical practice and public health interventions. In China, individuals with a higher incidence of ACEs among middle-aged and elderly people exhibit more late-onset depressive symptoms. This underscores the importance of addressing ACEs at the societal and familial levels to promote long-term mental health and well-being. Policymakers and communities should prioritize initiatives to reduce exposure to adverse experiences, such as strengthening social support systems, promoting safe environments, and raising public awareness of the long-term consequences of early life adversity. To operationalize these goals, we recommend integrating ACE screening tools (e.g., WHO ACE-IQ adapted for older adults) into routine health assessments for middle-aged and elderly populations within primary care systems (53). Early identification of high-risk individuals could trigger targeted lifestyle interventions, such as community-based programs offering structured physical activity sessions, sleep hygiene workshops, and social engagement hubs tailored to rural and low-literacy populations. Additionally, we found that lifestyle factors partially mediated the relationship between ACEs and the initial severity and progression of depressive symptoms. This suggests that promoting healthy lifestyles could be an effective strategy to mitigate the long-term impact of childhood adversity on mental health, particularly for middle-aged and elderly individuals. Interventions targeting lifestyle factors, such as physical activity, diet, sleep, social connections, mindfulness-based stress reduction (MBSR) and social prescription initiatives, may be especially beneficial for individuals with a history of childhood adversity (54, 55). Among the proposed interventions, structured physical activity programs (e.g., Tai Chi) and sleep hygiene workshops may be the most feasible, as they align with the cultural context and functional capacities of rural older adults in China, and can be readily integrated into existing community health infrastructures.
4.2 Limitations
To the best of our knowledge, this is the first study to explore the mediating effect of lifestyle factors in the relationship between ACEs and depression in a nationally representative Chinese population. However, several potential limitations of this study should be acknowledged. First, the reliance on self-reported data may introduce recall bias, particularly for retrospective reports of childhood adversity, so caution is needed in interpreting the relationship between ACEs and depression. Second, While the CHARLS dataset is nationally representative of middle-aged and elderly Chinese individuals, the findings may not be fully generalizable to other populations. Examining the effects of different populations would help researchers to propose more targeted guidance measures, and this should be considered in future studies. Third, although our lifestyle score integrated multiple health-related behaviors, the dichotomization of continuous variables (e.g., defining physical activity as a binary threshold of >10 minutes per week, or sleep duration as >6 hours per night) may have reduced variability in the measurement. This approach, while simplifying interpretation and aligning with prior CHARLS-based studies (41), could attenuate statistical power to detect nuanced associations between lifestyle gradients and depression trajectories. Future studies using continuous or multi-category operationalization of these constructs may provide more granular insights. Fourth, while our longitudinal design allows for temporal ordering of variables, the observational nature of the data limits causal inference. Reverse causality remains a possibility; depressive symptoms may reciprocally influence lifestyle behaviors (e.g., reduced physical activity due to low motivation) rather than solely reflecting ACE-driven pathways. Future research could employ cross-lagged panel models or intervention studies to better disentangle the directionality of these associations. Finally, While we controlled for a range of demographic factors, such as age, gender, marital status, and education level, there may still be other confounding variables that were not accounted for in the analysis. These could include genetic factors, environmental influences, or other psychosocial variables that may contribute to depression and lifestyle behaviors, affecting the strength and direction of the observed relationships. Future studies should consider a wider range of potential factors.
4.3 Conclusion
In conclusion, this study provides valuable insights into the complex relationship between ACEs, lifestyle factors, and depression in middle-aged and elderly individuals. The results suggest that while ACEs contribute to higher baseline depression severity, lifestyle factors play a critical mediating role in both the initial severity and progression of depressive symptoms. The findings highlight the importance of integrating lifestyle interventions into mental health strategies for individuals with a history of childhood adversity, particularly those exposed to expanded ACEs. We call on policymakers and mental health professionals to implement immediate actions: integrate ACE screening into primary care for older adults, and scale up community-based programs tailored to rural populations—steps aligned with China’s Healthy Aging goals to disrupt the ACEs-depression cycle. Future research should explore additional pathways through which ACEs influence mental health outcomes and further evaluate the effectiveness of lifestyle interventions in mitigating these effects.
Statements
Data availability statement
The datasets presented in this study can be found in online repositories. The names of the repository/repositories and accession number(s) can be found below: https://charls.charlsdata.com/index/zh-cn.html.
Ethics statement
The studies involving humans were approved by Ethics Review Board of Peking University (IRB00001052-11015). The studies were conducted in accordance with the local legislation and institutional requirements. The participants provided their written informed consent to participate in this study.
Author contributions
XC: Methodology, Writing – original draft. HY: Funding acquisition, Supervision, Writing – review & editing.
Funding
The author(s) declare that financial support was received for the research and/or publication of this article. This research was supported by the Nursing Research Project Plan of Sichuan Nursing Association (No. H24037). The funders played no role in the study design, data collection and analysis, publication decision, or manuscript preparation.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Generative AI statement
The author(s) declare that no Generative AI was used in the creation of this manuscript.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Supplementary material
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fpsyt.2025.1581908/full#supplementary-material
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Summary
Keywords
adverse childhood experiences, depression, lifestyle, middle-aged and older adults, mediating effects
Citation
Cai X and Yin H (2025) The longitudinal relationships among adverse childhood experiences, lifestyle, and late-life depression: a latent growth mediation model. Front. Psychiatry 16:1581908. doi: 10.3389/fpsyt.2025.1581908
Received
23 February 2025
Accepted
10 July 2025
Published
29 July 2025
Volume
16 - 2025
Edited by
Wan Mohd Azam Wan Mohd Yunus, Universiti Teknologi Malaysia, Malaysia
Reviewed by
Lucio Inguscio, Sapienza University of Rome, Italy
Cristiano Capurso, University of Foggia, Italy
Nur Asyikin Yakub, University of Technology Malaysia, Malaysia
Updates
Copyright
© 2025 Cai and Yin.
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*Correspondence: Haojie Yin, 215478163@qq.com
Disclaimer
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.