Socioeconomic status in childhood and obesity in adults: a population-based study

OBJECTIVE: To test whether there is an association between socioeconomic status in childhood and measures of body mass index, waist circumference and the presence of overall and abdominal obesity in adult life. METHODS: A cross-sectional analysis of a population-based cohort study, including a sample of adults (22-63 years old) living in Florianopolis, Southern Brazil. The socioeconomic status in childhood was analyzed through the education level of the participant's parents. Height, weight and waist circumference were measured by previously trained interviewers. Linear and logistic regressions with adjustment for confounding factors and stratification of data according to gender were used. RESULTS: Of the 1,222 adults evaluated, 20.4% (95% CI 18.1-22.8) presented overall obesity and 24.8% (95% CI 22.4-27.4), abdominal obesity. The body mass index and waist circumference averages among women were, respectively, 1.2 kg/m(2) (95% CI -2.3- -0.04) and 2.8 cm (95% CI -5.3- -0.2) lower among those with higher socioeconomic status in childhood. Among men, waist circumference was 3.9 cm (95% CI 1.0-6.8) higher in individuals with higher socioeconomic status in childhood. Regarding obesity, women of higher socioeconomic status in childhood had lower odds of abdominal obesity (OR = 0.56, 95% CI 0.34-0.90), and no such association was observed among men. CONCLUSIONS: The socioeconomic status in childhood influences body mass index, waist circumference and obesity in adults, with a difference in the direction of association according to gender. The higher socioeconomic status among men and the lower socioeconomic status among women were associated with higher adiposity indicators.