Table 5.

Multiple regression analysis for factors associated with operative time.

Factor	B	Standard error	Beta	t	p value	95% confidence interval for B
Use of endoscope	− 45.1	6.98	− 0.493	− 6.5	< 0.001*	− 58.9 to − 31.3
Presence of dyslipidemia	− 6.0	7.33	− 0.061	− 0.8	0.42	− 20.4 to 8.5
History of cardiovascular diseases	− 13.0	7.56	− 0.123	− 1.7	0.09	−  27.9 to 1.9
Hematoma volume preop	0.113	0.05	0.172	2.4	0.02*	0.02 to 0.20

Multiple regression analysis was performed using the factors selected by univariate analysis with p < 0.10 and |r|> 0.20; use of the endoscope, presence of dyslipidemia, history of cardiovascular disease, and preoperative hematoma volume.

B, coefficient.

*p < 0.05 by multiple regression analysis.