Sensitivity and specificity of classification systems for fatness in adolescents.

Background: Various body mass index (BMI) standards have been proposed for defining overweight in adolescence, but few studies have evaluated their diagnostic accuracy.

Objective: We compared the sensitivity and specificity of BMI-based classification systems for detecting excess fatness in adolescents.

Design: A cross-sectional analysis of 474 adolescents aged 17 y was used.