Figure 2

Follow-up BMI category based on BMI percentile and BMI percentage of the 95^thpercentile by age and BMI at the index visit. (A) For children with normal BMI at the index visit (N = 50,685), an increasing proportion of younger children were overweight at 2–3 years of follow-up (p < 0.001 comparing 6–7 and 8–9 year olds to 12–13 year olds, with no differences between 10–11 and 12–13 year olds, p = 0.6). (B) For children who were overweight at the index visit (N = 14,057), an increasing proportion of younger children were obese at follow-up (p <0.001, test for trend). (C) For children who were moderately obese at the index visit (BMI 100-119% of the 95^th percentile, N = 9848), an increasing proportion of younger children were obese at follow-up (p <0.001, test for trend). The proportions of moderately obese children who remained obese at follow-up were significantly different between all age groups (p <0.01) except for 10–11 year olds compared to 12–13 year olds. (D) For children who were severely obese at the index visit (N = 4295), nearly all were obese or severely obese at follow-up (95.7-99.3%). Children in the youngest age group (6–7 years old) had the highest prevalence of severe obesity at follow-up compared to other age groups (p <0.05). Differences between the older age groups were not significantly different.