The health status, social support, and subjective well-being of older individuals: evidence from the Chinese General Social Survey

Objectives This study aims to investigate the impact of health status and social support on the subjective well-being of older individuals. Methods Using data from the China General Social Survey 2017, this research analyzed 5,187 Chinese citizens aged 60 years and older. The predicted effect of each variable on subjective well-being was evaluated through hierarchical regression analysis. The direct and indirect effects of social support and health status on subjective well-being are examined based on a structural equation model. Results The mental health and social support positively impact subjective well-being. Mental health mediates the effect of physical health on subjective well-being, and social support mediates the relationship between physical and mental health and subjective well-being. Conclusion The findings provide strong evidence for the interrelationship mechanisms among the factors influencing subjective well-being. Consequently, improving mental health services and social support systems is advantageous for enhancing the well-being of Chinese seniors.


Introduction
The global population is undergoing unprecedented age structure changes marked by extended life expectancy, rapid population growth, and a rising proportion of seniors (1).China, entering the aging society in 2000, now boasts the world's largest older population, surpassing 264 million (2).Anticipated to exceed 400 million by 2035, constituting over 30% of the population, China faces deepening aging issues (3).Irreversible aging trends have spurred interest in active aging, focusing on the subjective well-being of older individuals as a vital measure for successful aging and a critical societal goal (4,5).
Subjective well-being (SWB) is a comprehensive assessment of living quality based on personal expectations, marked by subjectivity, stability, and wholeness (6).It has become a key policy goal in many nations, with some Chinese regional governments using citizens' SWB to evaluate officials (7,8).SWB is recognized as integral to successful aging (9); studies suggest a U-shaped trajectory of well-being, rising with age before declining, notably after 70 years (10,11).SWB, influenced by economic, social, and health factors, undergoes continuous changes across one's lifespan (12,13).
China's rapid aging is coupled with concerning health issues among older individuals (14), with up to 75% facing chronic conditions (15).Diminished well-being is associated with various diseases (16).Mental health is as crucial as physical health in older adults (17,18).Research shows that long-term physical health problems often lead to mental health problems like depression and anxiety, reducing subjective wellbeing and quality of life (19,20).The close connection between health and SWB grows with age (21,22).Additionally, as older adults' health deteriorates and their social roles change, they struggle to adapt to these dramatic changes to maintain average well-being, and it is necessary to have social support to cope with these changes and the gradual loss of resources (23,24).Social support, acting as an external resource through emotional support, substantive support, and information support avenues, mitigates life stress for older individuals, promoting positive emotional experiences and helping to maintain or improve the quality of life (25).Among the various social determinants, social support emerges as a substantiated protective factor for SWB, potentially mediating the link between older people's health status and SWB (26).
Health and social support are prerequisites for a person to have well-being, and the progression of active aging is inextricably linked to the well-being of older people (27)(28)(29)(30).Older individuals are an essential group in society, and their health and well-being are intimately related to the stability and advancement of society (31).By examining the role of social support as an intermediary, we can gain a more comprehensive awareness of the relevant factors that affect SWB in older individuals, which is of considerable practical value for promoting the development and optimization of the system of old-age services.Therefore, this study aims to consider older people's unique mental and physical characteristics, uncover the mechanisms of health status and social support on SWB, and provide a scientific foundation for enhancing their living quality, formulating social policy, and helping them overcome challenges in later life.
We propose the following hypotheses regarding the relationship between older individuals' health status, social support, and SWB based on the available evidence, Figure 1 H5: Social support mediates the relationship between mental health, physical health, and SWB.

Data sources
This study uses data from CGSS 2017 to conduct an empirical study.The CGSS is China's first nationwide, ongoing, comprehensive professional survey program (32).It used a multi-stage stratified probability sampling method to conduct a household survey in 28 provinces, municipalities, and autonomous regions of China, with questions at the social, community, household, and individual levels, and a total of 12,582 data items were collected.The CGSS 2017 stands out for its comprehensive coverage and representativeness; the questionnaire demonstrates high levels of authenticity and reliability (33).The subject of this study was older people aged 60 years and older, so the sample data of respondents below 60 years were excluded.After selecting the required variables in the database according to the research design, invalid samples such as "refused to answer, " "not applicable, " and "do not know" were removed.Finally, we obtained 5,187 valid samples.chosen as the primary variable of this research.The responses to both questions were rated on a scale from 1 to 5, with higher scores indicating a healthier condition.

Social support
The concept of social support encompasses many aspects, and most social support metrics are also examined across multiple dimensions.According to Wei et al. (34), social support comprises three components: social class identity, social interaction, and social security, are given as follows: Yes is 1 point, otherwise 0.
The greater the number of projects participants participate in, the higher the social security.

Subjective well-being
Subjective well-being is a person's assessment of their living quality following self-defined standards and is classified into different levels of subjective perception.In CGSS 2017, question A36, "Overall, do you feel that you are happy in your life?" was selected and rated on a scale from one to five, with a more significant score meaning greater subjective well-being.

Basic variables
Individual demographic variables and socioeconomic factors also affect the SWB of older individuals, which were included as controlled variables to decrease the interference of individual characteristics of the study subjects and external environmental factors on the study results, including the following:

Statistical analysis
The SPSS 26.0 and RStudio statistical programs were used for the data analysis.A statistical analysis of demographic variables was conducted employing descriptive statistics.The demographic differences in older individuals' subjective well-being were compared using the independent sample T-test and single-factor ANOVA.The correlation between the health status, social support, and SWB of older individuals was determined using Pearson correlation analysis.Exploring the factors influencing the SWB of older individuals using linear regression analysis.In addition, a structural equation model (SEM) is established to assess the proposed hypothesis model's fit with the data (35,36).The model was examined by maximum likelihood estimation.The model's fit was judged using the chi-square statistic (χ 2 /df ≤ 5), the Tucker-Lewis index (TLI ≥ 0.90), the comparative fit index (CFI ≥ 0.90), the root mean square error of approximation (RMSEA≤0.05),and the standardized root mean square residual (SRMR≤0.05)(37,38).Testing the mediation effect of the model with the Bootstrap test, the significance of the indirect effects was confirmed using the 95% bias-corrected confidence intervals from 5,000 Bootstrap samples (39,40).If "0″ was not contained within the confidence interval, the indirect effect is regarded as statistically significant, and when p < 0.05, statistical significance was assumed to exist (41).

Characteristics of demographic variables and differences in SWB
This study included 5,187 older individuals, 2,500 (48.2%) male and 2,687 (51.8%) female.The age range was between 60 and 109 years, with an average age of 71.88 and a standard deviation of 8.48.Among respondent groups, 49.8% had primary school education or less, 85.9% were non-communist party members, 52.4% were in rural households, 75.9% were married, and 93.2% of older people were at an average or below economic level.In terms of sex, age, education level, political affiliation, household type, marital status, and economic status, the differences in SWB of older individuals were statistically significant (p < 0.05), as shown in Table 1.discovered to have a positive connection with physical health; social support was positively associated with both mental and physical health; and mental health, physical health, and social support were positively correlated with SWB (p < 0.01).

Hierarchical regression analysis
Subjective well-being served as the dependent variable in the model.Simultaneously, physical health, mental health, and social support have been included as independent variables; demographic variables that were statistically significant after univariate analysis were used as control variables in the regression equation, and hierarchical regression was conducted.Model 1 only included demographic control variables; all variables significantly affected SWB except for household type.Model 2 added health status variables based on Model 1, where physical health, mental health, sex, age, marital status, and economic status significantly affected SWB, explaining 19.2% of the variance.Model 3 added the variable of social support based on Model 2, where mental health, physical health, social support, sex, age, marital status, and economic status were influential factors in the

Structural equation model analyses
The hypothetical model is tested using SEM and path analysis to assess the model's mediation effect.The fit of the structural model was calculated to determine whether the structural model aligns with the theoretical model.Table 4 displays the model's fit indices, and all indicators have appropriate values, indicating that this model achieves a satisfactory fit. Figure 2 shows the specific structural model.
Next, the bootstrap method (5,000 draws) was used to assess the significance of the multiple indirect effects in the study model.The indirect effects and 95% confidence intervals are shown in Table 5. Mental health and social support both have a significant direct effect on SWB (β = 0.173; β = 0.469, p < 0.001), and mental health has a significant indirect effect on SWB via social support, indicating a partial mediation effect of social support in the association between mental health and SWB (β = 0.118, 95% CI = 0.075-0.136,p < 0.001).The direct effect of physical health on SWB was insignificant (p = 0.457).However, through mental health and social support, physical health exerts a significant indirect effect on SWB.Thus, mental health and social support entirely mediate the association between physical health and SWB, respectively (β = 0.074, 95% CI = 0.043-0.075;β = 0.143, 95% CI = 0.085-0.155,p < 0.001).Furthermore, the effect of physical health on SWB through mental health followed by social support was significant (β = 0.050, 95% CI = 0.030-0.055,p < 0.001).

Discussion
This study contributes to understanding the quality of life of older people in China by testing a comprehensive model of the effects of health status and social support on SWB.The model discusses the crucial roles of mental health, physical health, and social support on older people's SWB.The analysis explores the direct and indirect relationships of these variables to uncover underlying mechanisms.
The findings suggest that physical health is an essential factor in the SWB of older individuals, but the direct effect on SWB is not significant, rejecting hypothesis H1.Mental health positively affects older individuals' SWB, supporting hypothesis H2, which aligns with findings from prior studies (42,43).Older adults with better mental health can have optimistic attitudes that enable them to cope effectively with life's adversities and challenges, resulting in higher well-being.Mental health helps to enhance the coping capacity and adaptability of older people to confront problems, thus increasing their subjective well-being (44, 45).The older adults' level of subjective well-being can be positively predicted by their mental health (46).Consistent with hypothesis H3, mental health mediates the association between physical health and SWB of older individuals, which implies that physical health can indirectly influence older individuals' subjective well-being through mental health.A deterioration in an older person's physical health can sometimes be followed by a fall in their mental health, and that leads to lower well-being.This is consistent with other literature that physical health can substantially impact the mental health of older individuals, and disability, chronic disease, insomnia, and other physical functions decreases in physical function can contribute to low self-esteem, anxiety, depression, and other mental issues in older individuals; physical frailty can quadruple the probability of depression (47,48); patients in their later years who suffer ailments such as chronic lung disease, arthritis, and coronary heart disease have been shown to have elevated levels of low mood as well as diminished hedonic and eudemonic well-being (21).Results of our study reveal that mental health is positively associated with  physical health and that older adults experience depression, frustration, or restlessness due to physical pain and impairment (49).Thus, physical health can influence mental health, which, in turn, can impact subjective well-being.By fostering an overall improvement in the mental health of older individuals, negative emotions due to physical health problems can be reduced, thereby improving subjective well-being (50,51).The findings emphasize the importance of mental health among older adults, a finding that may have multiple implications at the individual, societal, and policy levels.For older adults, recognizing the positive association between mental health and SWB may motivate individuals to pay more attention to and maintain their mental health, such as by seeking mental health services and engaging in social activities, thereby improving their SWB.This result may enhance social awareness and attention to mental health problems, especially among the older population.Senior care organizations and social services are encouraged to consider the mental health needs of older people more comprehensively and provide more mental health support services, including social and recreational activities and mental health counseling, to improve the well-being of older people.Additionally, this may lead governments to focus more on the mental health of older people in their policy development, including increased investment in mental health services, the provision of more mental health resources, and the adoption of more comprehensive policies on the care of older people in order to enhance their overall quality of life and sense of well-being.
Social support has an immediate impact on the SWB of older individuals, supporting hypothesis H4, which is consistent with past research indicating that social support has a beneficial influence on older individuals' SWB (52).That is, the more social support an individual perceives, utilizes, and receives, the higher well-being one can attain in senior living.Therefore, high levels of social support play a crucial role in enhancing the well-being of older individuals.Consistent with hypothesis H5, our findings indicate that social support mediates the association between older individuals' physical and mental health and their SWB, suggesting that physical and mental health indirectly influence SWB through social support.Older individuals with better physical and mental health have a stronger self-identification, a greater probability of having positive relationships with others, can use available resources more positively, obtain higher social support, and experience greater personal well-being.This result concurs with findings of other research displaying that older individuals with better physical health can participate in more social activities, thereby increasing their identification with their social status, expanding their social circle, and gaining a tremendous amount of social support, which in turn contributes to and enhances their perception of well-being (53, 54); older individuals with better mental health tend to have a more optimistic mentality, and this mindset helps individuals feel more respect, support, and understanding in their social interactions, resulting in higher levels of social support, which expands their personal and social resources and raises their level of well-being (55); older people in better health feel more support from their family, friends, and society, and more significant quantities of available social support increase SWB in their later lives (56, 57).In addition, the model's mediating effect validates the value-added spiral effect of the theory of resource conservation (58).That is, older individuals with high personal resources (physical health and mental health) are more inclined to develop new resources (social support), and the accumulation of such resources will lead to critical potential benefits (increased SWB).Compared with previous studies, the present study integrates physical and mental health factors and explains the mechanisms influencing SWB in older adults more comprehensively by considering social support as one of the critical factors connecting health status and SWB.The results emphasize the The multiple indirect effects model with standardized coefficients.importance of social support for adults, and focusing on social support while maintaining their physical and mental health may be an essential strategy for promoting overall well-being, which plays a vital role in establishing social identity, promoting interpersonal relationships, and providing psychological security.In addition, the results emphasize the need to strengthen the social support system, prompting social organizations and government agencies to pay more attention to providing and improving social support to better meet the spiritual needs of older people and improve their SWB.However, this study has several limitations that need further improvement.Firstly, because the current study used a cross-sectional analysis, it could not determine the causal inference among health status, social support, and SWB.Future research should consider longitudinal designs to better understand the direction and causal relationships among variables.Secondly, in addition to health status and social support, additional variables, such as the way of old-age care and attitudes toward aging, affect the SWB of older individuals and need to be explored in future research.Thirdly, all of the variables measured in this research were those the participants self-reported, so it was impossible to exclude the influence of other factors, such as emotions and life stress, on the results.Fourthly, although the model in this study demonstrated a good fit, alternative models were not tested, so the possibility that other models could also fit adequately cannot be ruled out.Finally, this study is based on Chinese older adults.Due to cultural differences, regional differences, and national policy differences, the findings of this study may not apply to all older populations, especially those in Western countries.They could be further expanded to investigate other countries or ethnicities.

Conclusion
To summarize, this study used data from the CGSS 2017 and employed hierarchical regression analysis and SEM to analyze the influencing mechanisms of older individuals' SWB from personal and social perspectives.The findings underscore the crucial roles of social support and mental health in promoting SWB among older people.To enhance the well-being of older individuals, the focus should be on improving social support through continuous enhancements to social security and medical insurance systems.Advocacy for active participation in society, fostering interpersonal relationships, and facilitating group support can solve problems like lack of mental comfort, insufficient financial support, and life care.Additionally, prioritizing mental health services for older individuals is vital.Governments and societies should provide targeted interventions, care, and positive psychological support for those at higher mental health risks and develop community-based social activities to further enrich their lives and improve mental health.

:H1:
Physical health positively impacts the SWB of older individuals.H2: Mental health positively impacts the SWB of older individuals.H3: Mental health mediates the relationship between physical health and SWB.H4: Social support positively impacts the SWB of older individuals.

Table 2
presents the findings of a correlation analysis performed on the research variables.As seen from the results, mental health was

TABLE 2 Health
status, social support, and subjective well-being scores and correlations in older individuals (N = 5,187).**p < 0.01.

TABLE 1
Descriptive statistics of demographic variables and differences in subjective well-being scores (N = 5,187).

TABLE 3
Hierarchical regression analysis of older individuals' subjective well-being (N = 5,187).

TABLE 5 SEM
path coefficient estimation and bootstrap confidence intervals.PH, Physical health; MH, Mental health; SS, Social support; and SWB, Subjective well-being.