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Pediatr Res ; 88(4): 676-680, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32050255

RESUMO

BACKGROUND: Obesity has been associated with earlier thelarche, whereas other predictors for it remain unclear. METHODS: We studied child-related and parental predictors for earlier thelarche in 195 girls aged 6-8 years followed up for 2 years. A physician evaluated breast development by inspection and palpation. Body fat percentage (BF%) was measured by dual-energy X-ray absorptiometry, diet by food records, and physical activity and sedentary time by body movement and heart rate monitors. Parental education, smoking, and alcohol consumption and household income were assessed by questionnaires. Gestational age, birth weight, and maternal prepregnancy BMI were obtained from hospital registers. Predictors for thelarche were examined using logistic regression analysis adjusted for age and follow-up time. RESULTS: The incidence of thelarche during 2 years increased by 11% (OR 1.11, CI 1.06-1.17, p < 0.001) for 1 unit increase in baseline BF%. Girls with a smoking parent had a 2.64 (95% CI 1.21-5.77, p = 0.015) times higher incidence of thelarche than other girls. The associations of lower parental education and higher maternal prepregnancy BMI with the higher incidence of thelarche were largely explained by BF%. Other possible predictors were not associated with thelarche. CONCLUSIONS: Higher BF% and exposure to tobacco smoke are independent predictors for earlier thelarche.


Assuntos
Tecido Adiposo , Índice de Massa Corporal , Mama/crescimento & desenvolvimento , Obesidade Infantil/complicações , Puberdade Precoce/complicações , Poluição por Fumaça de Tabaco/efeitos adversos , Absorciometria de Fóton , Adiposidade , Consumo de Bebidas Alcoólicas , Peso ao Nascer , Criança , Dieta , Escolaridade , Família , Comportamento Alimentar , Feminino , Finlândia , Frequência Cardíaca , Humanos , Incidência , Movimento , Pais , Fumar , Classe Social
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