Table 3.

Regression model: the effects of preoperative characteristics on operative time.

	Parameter estimate	Standard error	t	P
Intercept	58.68	42.98	1.37	0.1771
Group (A)	107.63	31.76	3.39	0.0012
Group (B)	170.72	35.46	4.81	<.0001
Prior pelvic surgery	−10.44	7.85	−1.33	0.1882
Teaching case (NT)	48.91	29.45	1.66	0.1018
Type of surgery	38.17	15.12	2.52	0.0142
Body mass index (less than 30)	−17.78	17.37	−1.02	0.3102
Estimated blood loss	0.12	0.05	2.42	0.0183