Insulin resistance in U.S. Pima and Mexican Pima Indians with normal glucose tolerance measured by fasting insulin and HOMA-IR. Fasting insulin (A) and HOMA-IR (B) values are presented as exponentiated means with 95% CIs, adjusted for age, sex, BMI, and waist circumference. USPimas, U.S. Pima Indians; MxPimas, Mexican Pima Indians.