. Author manuscript; available in PMC: 2015 Jan 17.

Published in final edited form as: Cochrane Database Syst Rev. 2009 Apr 15;(2):CD007214. doi: 10.1002/14651858.CD007214.pub2

Comparison 6. TENS versus placebo. Subgroup analysis by parity.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Women reporting severe pain	1	123	Risk Ratio (M-H, Fixed, 95% CI)	0.84 [0.65, 1.09]
1.1 Primiparous women	1	92	Risk Ratio (M-H, Fixed, 95% CI)	0.85 [0.64, 1.13]
1.2 Multiparous women	1	31	Risk Ratio (M-H, Fixed, 95% CI)	0.81 [0.43, 1.53]
2 Women who would use TENS again in a future labour	1	150	Risk Ratio (M-H, Fixed, 95% CI)	1.67 [1.22, 2.29]
2.1 Primiparous women	1	100	Risk Ratio (M-H, Fixed, 95% CI)	1.56 [1.04, 2.35]
2.2 Multiparous women	1	50	Risk Ratio (M-H, Fixed, 95% CI)	1.87 [1.14, 3.09]