Table V.

Multivariate analysis in the final backward linear regression model of pelvic anatomical parameters and operative time.

	Unstandardized coefficient		Standardized coefficient
Model	B	SE	β	t	P-value
(Constant)	485.547	121.961		3.981	<0.001
Anteroposterior diameter of the pelvic inlet	−2.387	0.893	−0.749	−2.673	0.010
Anteroposterior diameter of the pelvic outlet	−5.265	1.727	−1.177	−3.048	0.004
Height of pubic symphysis	−7.103	2.168	−0.645	−3.276	0.002
Sacrococcygeal distance	4.075	1.534	1.458	2.657	0.010
Sacrococcygeal-pubic angle	−7.006	2.273	−1.590	−3.082	0.003
Diameter of the upper pubis to the coccyx	4.707	1.587	1.043	2.966	0.005

R=0.467, R²=0.218, R_C²=0.130, F=2.463; Model utility test, P=0.036. n=60. SE, standard error.