Table 4.

Multivariate Analysis with Perineal Trauma versus Intact/other Trauma as the Outcome^*

Exposure	Adjusted OR	95% CI	p-value
Age (years)	1.10	1.05-1.16	<0.001
Infant HC (cm)	1.22	1.05-1.43	0.01
Compound Presentation	2.40	1.14-4.66	0.02
Time of Active Second Stage (Hours)	1.38	1.08-1.72	0.01

OR: odds ratio; CI: confidence interval; HC: head circumference

^*Factors entered into the regression model: age, race, infant HC, infant length, infant weight, compound presentation, total length of the second stage of labor, delivery of the head with contraction, occiput posterior or occiput transverse position, and operative vaginal delivery.