Receiver operating characteristic (ROC) curves to identify birth weight cutoffs to predict overweight in Mexican school children

Abstract

Resultados: Entre as crianças, a prevalência de excesso de peso foi maior no sexo feminino (46%) que no masculino (38,5%); entre adolescentes, as respectivas prevalências foram de 43,5 e 38,9%. O IMC médio e os decis de peso ao nascer apresentaram relação linear. As áreas sob as curvas ROC apresentaram valores ≥ 78% em cada estrato, detectando-se diferença, em relação ao sexo, no grupo de adolescentes. As curvas TG-ROC apresentaram pontos de corte do peso ao nascer mais elevados nos meninos que nas meninas, e as intersecções das curvas de sensibilidade e especificidade foram ≥ 0,70. Conclusões:Os resultados do estudo indicaram que pontos de corte do peso ao nascer podem ser utilizados como marcadores de excesso de peso, na infância e adolescência, constituindo-se em estratégia para o rastreamento de grupos de risco. J Pediatr (Rio J). 2009;85(1):42-47:Índice de massa corporal, peso ao nascer, sensibilidade e especificidade, estudos transversais. AbstractObjective: To identify birth weight cutoffs to predict overweight in school children and adolescents from Chilpancingo, Mexico, in 2004. Methods:Six hundred and sixty-two male and female children between 5 and 13 years old were selected by probability sampling. Birth weight measures were extracted from vaccination cards. The school children's nutritional status was defined using specific body mass index (BMI) cutoffs according to sex and age. Predicting equations were built using linear regression models. Areas under the receiver operating characteristic (ROC) curves were calculated and two-graph (TG) ROC curves were plotted, respectively, to detect global accuracy and to identify birth weight cutoffs corresponding to the intersection of sensitivity and specificity curves.Results: Overweight prevalence was higher in female (46%) than in male school children (38.5%). Among adolescents, the prevalence of overweight was also higher in females (43.5%) than in males (38.9%). BMI average and birth weight deciles showed a linear relation. Areas under ROC curves showed values ≥ 78% in each stratum of sex and age, depicting a difference by sex in adolescents. TG-ROC curves showed that birth weight cutoffs were slightly higher in boys than in girls, and the sensitivity/specificity intersections were ≥ 0.70. Conclusions:The study results showed that birth weight cutoffs can be used as overweight markers in childhood and adolescence, being useful as a screening strategy to detect risk groups.J Pediatr (Rio J). 2009;85(1):42-47: Body mass index, birth weight, sensitivity and specificity, cross-sectional studies.

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Excesso de peso corporal na adolescência segundo períodos críticos para a gênese da obesidade durante a infância

“…Verificou-se associação entre excesso de peso corporal aos 10 anos de idade com alto peso ao nascer (Tabela 03), que se manteve após ajuste para demais variáveis. e na segunda década de vida (Gigante et al, 2008), em estudo de coorte com crianças chilenas (Loaiza et al, 2011), em crianças e adolescentes mexicanos (Moraes et al, 2009), em crianças norte americanas com idades entre 9 e 11 anos (Boney et al 2005), na coorte dinamarquesa entre os 6 e 13 anos de idade (Rugholm et al, 2005), em coorte de adolescentes norte-americanos com peso ao nascer maior de 4,0kg cujas mães não eram obesas e em revisões sistemáticas da literatura (Martins & Carvalho, 2006;Rossi & Vasconcelos, 2010).…”