Table 6. Regression analysis results for maximal gaps.

Variables	Simple linear regression analysis				Multiple regression analysis
	Coefficient	Standard error	P value		Coefficient	Standard error	P value
Age	0.0128	0.0101	0.2076		0.0069	0.0113	0.5455
Male	−0.0362	0.1301	0.7815		−0.0725	0.1837	0.6941
BSA	−0.2358	0.6722	0.7266		−0.0720	0.9115	0.9372
Primary diagnosis
Valvular	0.1625	0.1161	0.1651		0.3442	0.2630	0.1942
Ischemic	−0.1667	0.1418	0.2428		0.0958	0.2653	0.7189
Aortic	−0.067	0.1427	0.6401		0.1801	0.2532	0.4788
Others	0.1613	0.2173	0.4598		0.4086	0.3297	0.2187
Sternal pin	0.0068	0.1163	0.9535		−0.0171	0.1277	0.8936

R square for multiple regression analysis =0.0576. BSA, body surface area.