Table 4. Stepwise multiple regression analysis on augmentation index as dependent variable in whole study population and in NGT subjects with different glucose tolerance status.

	All			NGT<155			NGT≥155			IGT
	Partial R2 (%)	P	Partial R2 (%)		P	Partial R2 (%)		P	Partial R2 (%)		P
1-h glucose, mg/dl	16.0	<0.0001	8.3		<0.0001	24.3		<0.0001	16.1		<0.0001
Age, yrs	2.2	<0.0001	4.2		<0.0001	–		–	–		–
Fasting insulin, µU/ml	1.1	0.004	–		–	–		–	4.5		0.003
BMI, Kg/m2	0.7	0.023	1.3		0.035				–		–
Gender	0.6	0.045	1.8		0.027	–		–	–		–
Total R2 (%)	20.6		15.6			24.3			20.6

BMI  =  body mass index.