Figure 4. Changes in AIRg relative to changes in S_I index in Pima Indian subjects in whom glucose tolerance deteriorated from normal glucose tolerance (NGT) to impaired glucose tolerance (IGT) to diabetes (DIA) (progressors) and in subjects who retained NGT (nonprogressors).

Lines represent the prediction line and the lower and upper limits of the 95% confidence interval of the regression between AIRg and S_I index, as derived from a reference population of Pima Indians with NGT. Adapted from Journal of Clinical Investigation (82).