INTRODUCTION: The purpose of this study was to describe the prevalence of obesity among American Indian and Alaska Native (AI/AN) adults with diabetes and to examine the temporal trends for class I, II, and III obesity in this high-risk group during a 10-year period. METHODS: We used data on body mass index (BMI) from the annual Diabetes Care and Outcomes Audit to estimate the prevalence of class I, II, and III obesity (class I = 30.0-34.9 kg/m2, class II = 35.0-39.9 kg/m2, and class III > or = 40.0 kg/m2) in each year from 1995 through 2004. We also investigated trends in mean BMI during the 10-year period and the role of treatment in these trends using multivariable linear regression models. RESULTS: Obesity was highly prevalent in this population in 2004 (class I, 28.9%; class II, 20.4%; class III, 20.3%). From 1995 through 2004, the percentage of obese adults increased from 16.7% to 20.4% in class II and 11.5% to 20.3% in class III (P
