Percent difference per quintile in 2-hour glucose levels, Matsuda ISI and disposition index across quintiles of height (at baseline) in nondiabetic subjects having both baseline and follow-up data (N = 5401). Percent difference calculated based on mean values obtained from analysis of variance. Quintile 1 (reference) includes shortest subjects. N for each quintile: 1100, 1040, 1129, 1031, 1101. Overall P values for both baseline and follow-up data based on analysis of variance for all 3 variables were ≤0.001. Reference values at baseline (2-hour glucose, 6.24 ± 1.61; Matsuda ISI, 6.87 ± 3.97; disposition index, 160.66 ± 69.29) and at follow-up (2-hour glucose, 6.49 ± 2.02; Matsuda ISI, 6.07 ± 4.19; disposition index, 153.30 ± 73.47). Significant P values in comparison with reference category were indicated as follows: *P < 0.05; **P < 0.01; ***P < 0.001