Hackenhaar Marisa Luzia, Sichieri Rosely, Muraro Ana Paula, da Silva Regina Maria Veras Gonçalves, Ferreira Marcia Gonçalves
Rev Saude Publica. 2013 Oct;47(5):942-51. doi: 10.1590/s0034-8910.2013047004690.
To analyze the association between social mobility, lifestyle and body mass index in adolescents.
A cohort study of 1,716 adolescents aged 10 to 17 years of both sexes. The adolescents were participants in a cohort study and were born between 1994 and 1999. The adolescents, from public and private schools, were assessed between 2009 and 2011. Lifestyle was assessed by interview and anthropometry was used to calculatebody mass index. For the economic classification, both at pre-school age and in adolescence, the criteria recommended by the Brazilian Association of Research Companies were used. Upward social mobility was categorized as an increase by at least one class in economic status within a 10-year-period. Poisson regression was used to estimate the association between upward social mobility and the outcomes assessed.
Among all respondents (71.4% follow-up of the cohort), 60.6% had upward social mobility. Among these, 93.6% belonged to socioeconomic class D and 99.9% to economy class E. Higher prevalence of social mobility was observed for students with black skin (71.4%) and mulatto students (61.9%) enrolled in public schools (64.3%) whose mothers had less schooling in the first evaluation (67.2%) and revaluation (68.7%). After adjustment for confounding variables, upward social mobility was associated only with sedentary behavior (p = 0.02). The socioeconomic class in childhood was more associated with the outcomes assessed than was upward mobility.
Upward social mobility was not associated with most of the outcomes evaluated, possibly as it is discreet and because the period considered in the study may not have been sufficient to reflect substantial changes in lifestyle and body mass index in adolescents.
分析青少年社会流动、生活方式与体重指数之间的关联。
对1716名10至17岁的青少年进行队列研究。这些青少年是一项队列研究的参与者，出生于1994年至1999年之间。他们来自公立和私立学校，于2009年至2011年期间接受评估。通过访谈评估生活方式，并使用人体测量法计算体重指数。对于经济分类，在学前年龄和青少年时期均采用巴西市场研究协会推荐的标准。社会向上流动被定义为在10年期间经济地位至少上升一个等级。采用泊松回归估计社会向上流动与所评估结果之间的关联。
在所有受访者中（队列随访率为71.4%），60.6%有社会向上流动。其中，93.6%属于社会经济D类，99.9%属于E类。在公立学校就读的黑人学生（71.4%）和混血学生（61.9%）中观察到较高的社会流动率，这些学生的母亲在首次评估（67.2%）和重新评估（68.7%）中受教育程度较低。在对混杂变量进行调整后，社会向上流动仅与久坐行为相关（p = 0.02）。童年时期的社会经济阶层比向上流动与所评估的结果更相关。
社会向上流动与大多数评估结果无关，这可能是因为其不显著，且研究中所考虑的时间段可能不足以反映青少年生活方式和体重指数的实质性变化。
