Investigating factors influencing overweight and obesity among adult households in Ethiopia: a multilevel ordered analysis of 2016 EDHS data

Abstract

Background:

In both high- and low-income countries, including Ethiopia, overweight and obesity have emerged as public health issues of the 21st century. Hence, obtaining conclusive evidence concerning the factors that influence adults’ body mass index is important. Therefore, using representative data, our study sought to provide solid evidence on factors influencing overweight and obesity among adults in Ethiopia.

Methods:

The 2016 Ethiopia Demographic and Health Survey (EDHS), a dataset composed of a nationally representative sample of the survey, served as the basis for the study. Both descriptive and analytic findings were produced using STATA version 14. The data collection were conducted from January to June 2016. A total sample of 39,749 adults, 18 years and older, were included. Predictors were assessed using multivariable ordinal logistic regression analysis, and the results were presented as an adjusted proportional ratio (POR) with a 95% confidence interval. Statistical significance was declared at a p-value of <0.05.

Results:

Overall, the magnitude of overweight and obesity among adults in Ethiopia was 8.5% (95% CI: 8.2% to 8.7%) and 2.9% (95% CI: 2.7% to 3.1%), respectively. Predictor variables such as smoking (POR = 0.53, 95% CI: 0.42–0.67); being female (POR = 1.21, 95% CI: 1.13–1.30); being married (POR = 1.91, 95% CI: 1.26–2.90); having a secondary education (POR = 1.42, 95% CI: 2.23–1.64); having a diploma and above education (POR = 1.78, 95% CI: 1.44–2.21); having a poorer (POR = 1.22, 95% CI: 1.13–1.31), middle (POR = 1.30, 95% CI: 1.20–1.40), richer (POR = 1.35, 95% CI: 1.25–1.47), and richest (POR = 3.13, 95% CI: 2.79–3.51) wealth index rating; and having a rural residence (POR = 0.48, 95% CI: 0.43–0.54) were significantly associated with overweight and obesity.

Conclusions:

Overall, 8.5% and 2.9% of Ethiopian adults were overweight and obese, respectively. Factors such as smoking, sex, marital status, educational status, wealth index, residence, and region were significantly associated with overweight and obesity among adult households. As a result, enhancing lifestyle modifications is enormous, and it is necessary to have more tangible evidence concerning the factors influencing body mass index utilizing more representative data from local and global.

Introduction

Overweight and obesity are defined as abnormal or excessive fat accumulation that may impair the health of individuals (1). Body mass index (BMI) is a simple index of weight for height that is commonly used to classify overweight and obesity in adults and also stipulates the most useful population-level measure of overweight and obesity as it is the same for both sexes and for all ages (2, 3). A high BMI can designate high body fatness and is used for screens for weight categories that may lead to health problems; its range is differently categorized: Its range is divided into four categories: underweight (BMI less than 18.5), healthy weight (18.5 to 24.9), overweight (25.0 to 29.9), and obese (30.0 or higher) (4).

Currently, overweight and obesity are public health concerns, with obesity being one of the leading risk factors for premature death and 8% of global deaths being ascribed to obesity (5, 6). In most high-income countries, approximately two-thirds of adults are classified as overweight or obese; compared to the regions of South Asia and Sub-Saharan Africa, where the rate is closer, around one in five adults have a BMI greater than 25 (5). In addition, both obesity and overweight are associated with amplified disease-specific morbidity, 4.0 million deaths globally, and approximately 36.3 million YLLs, and cost a total of $4.32 trillion worldwide, $3.8 billion in health expenditure in Saudi Arabia, and $552.31 million in Ethiopia (7–12).

Factors related to the problem of overweight and obesity are unhealthy lifestyle habits, such as a sedentary lifestyle, smoking, and eating high-calorie, low-nutrient foods and beverages. Additionally, socioeconomic and health conditions can raise the overweight and obesity levels of individuals (13–16). Therefore, limiting unhealthy foods (refined grains and sweets, potatoes, and processed meat) and beverages (sugary drinks); increasing physical activity; limiting television, screen time, and other “sit time”; improving sleep; and reducing stress are all recommended as ways to prevent, treat, and control the health consequences of being overweight and obese (17, 18).

A lot of effort has been made to alleviate the burden of overweight and obesity. The World Health Organization (WHO) calls on all stakeholders to take action at the global, regional, and local levels to improve diets and physical activity patterns at the population level and recognizes that non-communicable diseases (NCDs) are a major challenge for sustainable development goals in the 2030 Agenda for Sustainable Development (19). The Ethiopian government has worked on the prevention and control of adult overweight and obesity through encouraging physical activity, promoting fruit intake and whole grain intake, educating on reducing processed meat intake, and providing mental health support (11). Even though many efforts were made on reducing overweight and obesity, the magnitude and morbidity of overweight and obesity are still increasing in developed and developing countries, including Ethiopia (20–22).

Overweight and obesity are complex issues caused by genetic, behavioral, cultural, and environmental factors. Changes in policies within the government, social environment, and cultural norms are required, in addition to individual behavioral changes. Most nutritional programs in Ethiopia focus on childhood undernutrition. Identifying factors influencing overweight and obesity is crucial for preventing and managing these developing public health issues in Ethiopia (23). Therefore, this study was conducted to further investigate the factors influencing overweight and obesity among adults in Ethiopia using representative data.

Methods and materials

Study design, setting, and period

The source of this study is the nationally representative 2016 Ethiopia Demographic and Health Survey (EDHS). Ethiopia is located between 3° and 15° North latitudes and 33° and 48° East longitudes. The country has nine regional states [Amhara, Oromia, Tigray, Benishangul-Gumuz, Somali, Afar, Harari, Southern Nations Nationalities and Peoples (SNNP), and Gambella] and two city administrations (Addis Ababa and Dire Dawa) (24, 25). The survey was conducted in a nationally representative sample and provided estimates at national and regional levels for rural and urban areas.

Population and sampling

The EDHS used a two-stage cluster sampling design with rural–urban regions as strata. In the first stage, enumeration areas (EAs) were selected with probability proportional to EA size, with independent selection in each sampling stratum. In the second stage, an appropriate number of households per cluster were selected with an equal probability of systematic selection. This study used a total sample of 39,749 adults in the analysis that was extracted from the EDHS survey. Further information regarding the sampling technique and questionnaire, in general about the survey, can be accessed from the EDHS 2016 report (26). Datasets for adults were downloaded from the MEASURE DHS website.

Study variables and measurements

The outcome variables were as follows: underweight, normal, overweight, and obesity, based on the BMI measurement of adult people. Overweight and obesity are categorized based on the WHO Classification of BMI: BMI = weight in kilograms divided by height in meters squared. Individuals were classified as overweight if their BMI is 25.0–29.9 kg/m² and as obese if their BMI is 30 kg/m² or higher (27). The independent variables included demographic characteristics and behavior-related characteristics of adult people. In addition, the community-level factors like region and residence were considered as explanatory variables.

Statistical analysis

Frequency distribution analysis was carried out. Data were analyzed using STATA version 14 statistical software. The data were weighted using sampling weight, primary sampling unit, and strata before any statistical analysis to ensure the representativeness of the survey and to consider the sampling design when calculating standard errors to get reliable statistical estimates.

To determine the relationship between household wealth index and overweight and obesity as well as to control confounders, logistic regression assumptions (chi-square and multicollinearity) were tested. Because members in a cluster shared a trait, the assumptions of the independence of observations and equal variance across clusters were broken. To ensure the accuracy of the standard error and unbiased estimate, it is important to overcome the violated independence assumption and take into account the variability between clusters in multilevel advanced statistical modeling.

Variables having a p-value of 0.25 were candidates for the individual level (Model II), community level (Model III), and the final model (Model IV). The mixed-effect model with the lowest Akaike and Bayesian Information Criteria (AIC and BIC) was chosen. A factor was designated as a significant predictor of obesity and overweight if its p-value was less than 0.05. The odds ratio was used to measure how strong the link was, with a 95% confidence interval. The estimation of the association between the BMI (underweight, normal, overweight, and obesity) and explanatory variables was performed using the fixed-effects model. An intra-cluster correlation coefficient (ICC) with standard deviation was employed to measure cluster variance. A null model (a model without independent variables), a model taking into account only individual-level factors, a model taking into account community-level variables, and a fourth model taking into account both individual and community-level variables were also fitted. The comparison of the multilevel-ordered logistic regression models was checked using the median odds ratio (MOR) and proportional change in variance (PCV). The best-fitting model among the fitted models was ultimately chosen using the AIC and BIC.

Results

Community-level, household, and individual-related characteristics of the study participants

Out of a total of 41,357 adults, 39,749 were included in this study. Approximately 5,788 (14.56%), 5,346 (13.5%), 4,888 (12.3%), 4,604 (11.58%), and 4,358 (10.96%) adults were included from the Oromia, SNNPR, Somalia, Amhara, and Tigray regions, respectively. More than two-thirds [n = 32,581 (81.97%)] of the study participants resided in rural areas. The majority (n = 29,052 adults) had no formal education. The majority of the study participants were men. Nearly one-third of the participants had the poorest wealth index. About n = 38,046 (95.7%) had no health insurance coverage. The majority of the participants [n = 20,872 (52.5%)] were not working (Table 1).

Behavioral characteristics of the study participants

Among the total adults, nearly one-third [n = 11,972 (30.1%)] of the study participants had a history of alcohol consumption. A total of 513 (1.3%) study participants were smokers. A total of 4,940 (12.3%) adults had a history of chewing khat. More than half [n = 26,546 (66.78%)] were not working at the time of data collection. Nearly two-thirds of the n = 26,947 (67.8%) study subjects were sexually active 4 weeks before the data collection time (Table 2).

The magnitude of BMI classifications

Out of the total n = 39,749 Ethiopian adult populations, n = 9,395 (23.6%), n = 25,844 (65%), n = 3,360 (8.4%), and n = 1,149 (2.95%) had underweight, normal, overweight, and obese BMI status, respectively (Figure 1).

Figure 1

Distribution of BMI classification among the study participants

Almost a quarter [n = 1,743 (24.3%)] of rural residents were overweight. Additionally, n = 1,103 (11.2%) of women were also overweight. Almost 1 in 10 [n = 2,503 (9.0%)] adults over the age of 35 were overweight. Furthermore, 1 out of every 10 [n = 871 (11.0%)] richest adults was obese. Of the n = 513 smokers, 30 (5.8%) were obese (Table 3).

Factors associated with overweight and obesity

The bivariable analysis revealed that variables having a p-value less than 0.2 were transformed into multilevel multivariable ordinal logistic regression. Finally, it resulted in significant associations between predictor variables, including smoking, sex, marital status, educational status, wealth index, residence, and region, and the dependent variable (overweight and obesity) (Table 4). Accordingly, those adults who had a habit of smoking cigarettes were 47% less likely to be overweight or obese as compared to adults who did not smoke (POR = 0.53; 95% CI: 0.42–0.67). In addition, those adults who reside in rural areas were 52% less likely to be overweight or obese than their counterparts (POR = 0.48, 95% CI: 0.43–0.54).

In another way, adult households with a wealth index of poorer, middle, richer, and richest were 1.22, 1.30, 1.35, and 3.13 times more likely to be overweight or obese compared to adult households with a wealth index of poorest (POR = 1.22, 95% CI: 1.13–1.31; 1.30, 95% CI: 1.20–1.40; 1.35, 95% CI: 1.25–1.47; and 3.13, 95% CI: 2.79–3.51), respectively. Moreover, adults whose educational status was secondary and diploma and above were 1.42 and 1.78 times more likely to be overweight or obese compared to adult households whose educational status is no formal education (POR = 1.42, 95% CI: 2.23–1.64 and 1.78, 95% CI: 1.44–2.21), respectively. Furthermore, female adults were 1.21 times more likely to be overweight or obese compared to adult households who were male (POR = 1.21, 95% CI: 1.13–1.30). Finally, the study revealed that the odds of being overweight or obese were 1.95 times higher among married adults than unmarried adults (POR = 1.91, 95% CI: 1.26–2.90) (Table 4).

Discussion

This study was conducted to determine the factors affecting overweight and obesity among adults in Ethiopia using representative data. According to this study, the overall magnitude of overweight and obesity among adult residents in Ethiopia was 8.5% (95% CI: 8.2% to 8.7%) and 2.9% (95% CI: 2.7% to 3.1%), respectively. The final model of multivariable ordinal logistic regression analysis indicated that predictor variables including smoking, sex, marital status, educational status, wealth index, residence, and region were significantly associated with overweight and obesity among adult households. The study revealed that, among overweight and obese adults, approximately 1.0% (95% CI: 0.6% to 1.2%) of them were cigarette smokers.

While some studies have shown no significant association between smoking status and obesity or overweight, others have suggested that smoking may significantly affect obesity or overweight (28–30). Our final model of multivariable analysis explicitly pointed out that adults’ habit of cigarette smoking was found to be associated with obesity/overweight. Accordingly, those adults who had a habit of cigarette smoking were 47% less likely to develop overweight or obesity as compared to adults who did not smoke. This finding is consistent with a study carried out in different regions of the world to determine the association between smoking and overweight or obesity (29, 31–33). One plausible explanation related to these facts could be that those who smoke cigarettes are less likely to have physical exercise, which inevitably leads those adults to experience overweight or obesity (29, 34–36).

The study also revealed that adult households with a wealth index of poorer, middle, richer, and richest had 1.22, 1.30, 1.35, and 3.13 times more likely to be overweight or obese compared to adult households with a wealth index of poorest. This finding is in line with similar studies that indicate that as the wealth index tertile rises, adults are more likely to be overweight or obese (37–39). This is explicitly related to the fact that as people’s income rises, sedentary lifestyles, such as traveling by automobile and eating a nutritious diet, may become more common at the individual or household levels; these activities increase the likelihood of developing overweight and obesity (40, 41). On this occasion, even though they are busy managing their wealth, they have the ability to consume the kind of food they need, and move from one place to another by car, and adults in this situation still need to think about healthy eating, physical activity, maintaining a healthy weight, managing stress, and getting enough quality sleep.

The study also depicted that adults whose educational status was secondary and diploma and above were 1.42 and 1.78 times more likely to be overweight or obese compared to adult households whose educational status is no formal education, respectively. This study is consistent with other research showing the relationship between educational attainment and the likelihood of being overweight or obese (42–44). One possible explanation could be that as educational attainment rises, the likelihood of earning a high income and residing in an urban area also rises. As a result, living in an urban area and earning a high income may expose adults to a sedentary lifestyle such as moving place to place by transportation, as well as increase the probability of consuming high-calorie food and drinks (45, 46).

In addition, our study revealed that female adults are 1.21 times more likely to be overweight or obese compared to male adult households. Our study is consistent with a study that revealed that the probability of being overweight or obese is higher among women (47–49). This is explicitly related to the fact that, most of the time, overweight and obesity are caused by individuals having a propensity to overeat and engage in prolonged periods of inactivity. Therefore, frequent consumption of junk food and snacks, eating in a hurry, eating regularly, and a sedentary lifestyle are all potential causes of obesity and overweight in women (50–53).

Moreover, our study revealed that, according to this study, the place where adults reside was found to be statistically significant to outcome variables. Accordingly, those who reside in rural areas were 52% less likely to develop overweight or obesity than their counterparts. This finding is consistent with studies conducted in China (54, 55). One of the possible justifications related to this could be that those who reside in rural areas may have the opportunity to consume organic and healthy food, which inevitably results to them not being prone to overweight or obesity. Moreover, the majority of outdoor activities in which rural dwellers engage undeniably play a prominent role in burning calories, thereby hindering obesity or overweight (55, 56).

Furthermore, according to this study, marital status of adults was one of the independent predictors of obesity or overweight. Accordingly, the odds of developing obesity or overweight were 1.95 times higher among married adults than those of their counterparts. This is in harmony with the studies conducted in Greece (57), USA (58), and Iran (59). This could be explained by the fact that in culturally deep-rooted counties such as Ethiopia, married men probably tend to be socially resigned, less focused on being attractive, and less physically active, which explicitly contribute to developing obesity or overweight.

Finally, our study revealed that overweight and obesity distribution was varied across Ethiopian regions. Socioeconomic variables, including economy, eating habits, productivity, and environmental circumstances, are strongly correlated with obesity and overweight (60–62). Therefore, in our study setting, Ethiopia has different regions, which are vividly found in the categories of several economic, agricultural, and environmental variations that either directly or indirectly expose people to those various socioeconomic and cultural elements that resulted in different levels of overweight and obesity among regions.

Practice implications

The findings of this study can be used to guide the development of programs aimed at preventing overweight and obesity in Ethiopia by informing policymakers and other stakeholders about this emerging nutrition-related problem among adult households in Ethiopia and also provide compelling evidence of the factors influencing overweight and obesity.

Limitations of the study

The EDHS is a cross-sectional survey that limits its ability to establish cause-and-effect relationships between smoking and overweight or obesity. The EDHS relies on self-reported information that can be inaccurate due to social desirability bias or recall bias. While the EDHS aims to be nationally representative, there might be some groups underrepresented in the sample. This could limit the generalizability of the findings to the entire population in the study area. Moreover, BMI as a predictor of overweight/obesity is somewhat questionable since there are several studies with contradictory ideas. Thus, further studies using longitudinal data to assess the temporal relationship between independent variables and overweight or obesity would help to determine if these factors precede overweight/obesity or vice versa.

Conclusion

The study revealed that approximately 8.5% and 2.9% of Ethiopian adults were overweight and obese, respectively. Factors including smoking, sex, marital status, educational status, wealth index, residence, and region were significantly associated with overweight and obesity among adult households. As a result, enhancing lifestyle modification interventions on overweight and obesity is enormous, and conducting more assessments to have more tangible and clear evidence concerning the factors influencing BMI utilizing more representative data from local to global would be important.

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