When cross-tabulating C-peptide (low vs. normal/high) and class membership (class 2 vs. other) among diabetics not taking insulin in the 2003–2004 NHANES data, the DTM has 75.5% sensitivity and 83.3% specificity for T2DM, indicating it identified 75.5% of all cases with normal/high C-peptide as likely to be T2DM and 83.3% of all cases with low C-peptide as unlikely to be T2DM (Table 3). The gene discussed is INS; the disease is type 2 diabetes mellitus.