Body mass index in children and adolescents according to age and pubertal stage

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Abstract
Objective: To evaluate the dependence of body mass index (BMI) values on pubertal stage in subjects similar in age. Design, subjects and measurements: Height and weight were recorded cross-sectionally in school subjects from three provinces in central Italy. The subjects were subdivided into three groups: (1) 4271 school subjects (2125 males and 2146 females; 8.5–15.5 y old), in whom the pubertal development was also recorded, were selected to subdivide BMI values according to pubertal stage and age; (2) 6345 females (10.5–14.5 y old), who were asked whether or not they had had their first menstrual period, were selected to subdivide BMI values according to age in pre-menarche and post-menarche girls, separately; and (3) 1919 females (10.5–14.5 y old), who had presented their menarche within the previous 6 months, were selected to subdivide short-term post-menarche BMI values according to age. Results: The medians and interquartile ranges of BMI varied according to age and pubertal stage. Kruskall–Wallis test performed in subjects similar in age demonstrated that significant differences existed among the medians of BMI values of subjects at different pubertal stages in 12–14-y-old males (PPPz-test for trend, PPPPPPz-test for trend (PEyropean Journal of Clinical Nutrition (2000) 54, 214–218

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