Figure 3. Normative BMI growth curves for boys and girls. Extended BMI curves for youth aged 2-20 years of age based on Gulati et al (30). Class 1 obesity defined as BMI between 95th- 120% of 95th percentile; Class 2 between 120%-140% of 9th percentile; Class 3 ≥ 140% of 95th percentiles (287).