Table 7. Regression analysis results for sternal instability.

Variables	Simple linear regression analysis				Multiple regression analysis
	Coefficient	Standard error	P value		Coefficient	Standard error	P value
Age	0.0077	0.0055	0.1661		0.0067	0.0061	0.2731
Male	0.0915	0.0707	0.1989		0.1680	0.0987	0.0925
BSA	−0.0616	0.3687	0.8677		−0.5709	0.4900	0.2469
Primary diagnosis
Valvular	0.1128	0.0632	0.0778		0.0508	0.1412	0.7201
Ischemic	−0.0453	0.0782	0.5637		−0.0886	0.1425	0.9526
Aortic	−0.1451	0.0768	0.0622		−0.0886	0.1360	0.5165
Others	0.006	0.1195	0.9604		−0.0658	0.1771	0.7110
Sternal pin	0.0075	0.0638	0.9062		−0.0283	0.0686	0.6806

R square for multiple regression analysis =0.0954. BSA, body surface area.