Table 2. Effects of BMI, CVA&CAD, HbA1c and ESR on hospital stay in multiple linear regression model with stepwise selection method.

Dependent variable (hospital stay)	Beta	Standard error	t	P value
Constant	-115.525	26.293	-4.394	0.001
BMI	4.016	0.848	4.736	0.001
CVA and CAD	24.368	6.635	3.673	0.004
HbA1c	2.839	1.041	2.728	0.021
ESR	0.223	0.091	2.457	0.034
Age	0.243	-	1.558	0.154
Sex	0.177	-	1.123	0.291
AST	-0.192	-	-1.122	0.291

R²=0.742. BMI, body mass index; CVA and CAD, cerebrovascular accident and coronary artery disease; ESR, erythrocyte sedimentation rate.