They cite the following markers for diabetes in this age group:
- Between 10 and 19 years old
- Obese
- Strong family history of type 2 diabetes
- Insulin resistance
- Poor glycemic control (A1C = 10% to 12%)
"Waist circumference is a predictor of insulin resistance syndrome in children and adolescents and could be included in clinical practice as a simple tool to help identify children at risk."
WebMD features a summary of the study, including examples of risky waist sizes:
- A 5-year-old boy or girl with a waist size of 22 inches or more
- A 10-year-old boy with a waist size of 26 inches or more
- A 10-year-old girl with a waist size of 25 inches or more
- A 15-year-old boy with a waist size of 31 inches or more
- A 15-year-old girl with a waist size of 28 inches or more
For the study itself (abstract only, subscription required for full article):
Can Waist Circumference Identify Children With the Metabolic Syndrome?
For WebMD's summary:
Kids' Waists May Show Pre-Diabetes Problem
For the CDC's fact page on children and diabetes:
Epidemiology of Type 1 and Type 2 Diabetes Mellitus Among North American Children and Adolescents