Serum leptin concentration during puberty in healthy non-obese adolescents. C.M.A. Brandão, M.T. Lombardi, S.K. Nishida, O.M. Hauache and J.G.H. Vieira. Brazilian Journal of Medical and Biological Research, 36 (10): 1293, 2003.

Figure 1. Mean serum leptin levels and 95% confidence interval for 95 male and 80 female adolescents stratified by body mass index (BMI) ranges (14-18, 19-23, >24). *P < 0.05 compared to subjects in smaller BMI ranges and **P < 0.001 compared to the first group, with BMI between 14-18 (Kruskal-Wallis test).