It was evaluated the effect of family socioeconomic status (SES) and social mobility on the trajectory of Body Mass Index (BMI) from birth to adolescence. A population based sample of 2405 children aged 0 to 5 years, living in the city of Cuiabá‐MT, Brazil in 1999, was followed. Socioeconomic Status was classified by an asset‐based wealth index called in: low, middle and high classes. Anthropometric data were measured at childhood and adolescence. Weight and length at birth were those from hospital records. Linear mixed effect models were used (using SAS Proc MIXED). A total of 1716 adolescents were followed to adolescence (71.4% of baseline) and 51.2% were male. The prevalence of overweight/obesity was 20.4% in childhood and 27.7% in adolescence. At adolescence, higher family SES was associated with higher prevalence of overweight/obesity. Expressive social mobility occurred, mainly among lowest SES group. There was a greater rate of change of BMI from birth to adolescence among those who were from higher SES in childhood and those who remained in the higher SES from childhood to adolescence. In conclusion, tracking a high BMI from childhood to adolescence occurred in the families of high SES at childhood, with no effect of social mobility.Financial support:CNPq and FAPEMAT.
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