. Author manuscript; available in PMC: 2006 Jan 25.

Published in final edited form as: J Midwifery Womens Health. 2005;50(5):365–372. doi: 10.1016/j.jmwh.2005.05.012

Table 5.

Predictors of Intact Genital Tract in Stratified Analyses ^*

	compresses vs hands off Crude RR 1.04 (95% CI .81–1.35)		massage vs hands off Crude RR 1.05 (.81–1/35)
Stratification variables	stratum-specific risk-ratio	adjusted RR	stratum-specific risk-ratio	adjusted RR
Parity
First birth	1.11 (.56–2.16)	1.09 (.85–1.39)	1.15 (.89–1.47)	1.05 (.82–1.33)
Other	1.08 (.83–1.41)		1.05 (.82–1.33)
Epidural
Yes	1.26 (.80–1.99)	1.06 (.82–1.37)	1.16 (.72–1.89)	1.05 (.82–1.36)
No	.97 (.71–1.32)		1.01 (.75–1.36)
Birthweight
≥ 4,000 grams	1.17 (.32–4.27)	1.04 (.81–1.34)	1.64 (.51–5.29)	1.04 (.81–1.35)
Under 4,000 gm	1.03 (.80–1.33)		1.02 (.78–1.32)
Timing
1^st year of study	1.03 (.69–1.54)	1.04 (.81–1.35)	1.00 (.67–1.50)	1.05 (.81–1.35)
Later	1.05 (.76–1.46)		1.08 (.78–1.50)

reported as RR (95% CI)