Strength of correlation of estimates using 4- and 6-h OMM protocols varies for subgroups specified by participants’ 4-h glucose concentrations relative to their baseline glucose concentrations. estimates calculated with the 4-h exponential OMM were strongly correlated with 6-h OMM estimates for participants who were 10 mg/dl within (n=24, all female, p < 0.001) and below (n=37, all female, p < 0.001) their baseline glucose concentrations after the first 4 h of the OGTT protocol but not for participants who were 10 mg/dl above (n=7, all female, p=0.06) (A). estimates calculated with the 4-h truncated OMM were correlated with 6-h OMM estimates for participants who were 10 mg/dl above (n=7, all female, p=0.03), within (n=24, all female, p < 0.001), and below (n=37, all female, p < 0.001) their baseline glucose concentrations after the first 4 h of the OGTT protocol (B).