Table 4. Association of the fasting- and OGTT-derived indices of insulin release with IVGTT-derived AIR (N = 274).

	AIR
Parameter	r	p
AUCInsulin(0-30)/AUCGlucose(0-30)	0.76	<0.0001
CIR	0.76	<0.0001
IGI2	0.75	<0.0001
First-phase insulin secretion	0.74	<0.0001
IGI1	0.72	<0.0001
AUCC-Peptide(0-30)/AUCGlucose(0-30)	0.72	<0.0001
Insulin 30 min	0.71	<0.0001
DI oral	0.70	<0.0001
AUCInsulin(0-120)/AUCGlucose(0-120)	0.70	<0.0001
C-Peptide 30 min	0.68	<0.0001
AUCC-Peptide(0-120)/AUCGlucose(0-120)	0.67	<0.0001
HOMA-β	0.64	<0.0001

Prior to multiple linear regression analysis, all continuous variables were log_e-transformed to approximate normal distribution. In the multiple linear regression models, AIR was chosen as dependent variable, the fasting-/OGTT-derived insulin secretion index as independent variable and gender, age, BMI, and OGTT-derived insulin sensitivity as confounding variables. AIR – acute insulin response; AUC – area under the curve; CIR – cleared insulin response; DI – disposition index; HOMA-B – homeostasis model assessment of beta-cell function; IGI – insulinogenic index; IVGTT – intravenous glucose tolerance test; OGTT – oral glucose tolerance test.