Correlation between SES and BMI and gender-disparity of mediation of lifestyle among Chinese people aged 45 and over
Abstract Background: Previous studies suggested the relationship between SES and BMI is different in developing countries and developed countries and lifestyle is medication between SES and BMI. Little research focused on relationship between SES and BMI among the middle and the elderly and gender-disparity of mediation of lifestyle. Methods: The data for this study were obtained from the 2015 follow-up data of the China Health and Retirement Longitudinal Study (CHARLS). Structural equation model (SEM) was used to explore the relationships among SES, lifestyles and BMI. Results: Among men, the effect of SES on sleeping time and smoking were not statistically significant. SES had a direct positive effect on BMI (b=0.306, P<0.001). Smoking had a direct positive effect on BMI (b=0.180, P<0.001). Among women, SES had a direct negative effect on physical activity (b=-0.048, p<0.05), a direct positive on sleeping time (b=0.048, P<0.05), smoking (b=0.098, P<0.001) and BMI (b=0.168, P<0.001). Physical activity had a direct negative effect on BMI (b=-0.050, P<0.01). Sleeping time (b=0.066, p<0.001) and smoking (b=0.088, p<0.001) both had a direct positive effect on BMI. Conclusion: A positive relationship was found between SES and BMI both among middle and old men and women. The gender-disparity of mediation of lifestyle was existed.