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. 2011 Feb 21;2011:0813.
Ref (type) Population Outcome, Interventions Results and statistical analysis Effect size Favours
Pain

Systematic review
21 women with primary dysmenorrhoea
Data from 1 RCT
Proportion of women with pain relief measured by subjective assessment
16/21 (76%) with high-frequency TENS
9/21 (43%) with low-frequency TENS

OR 3.9
95% CI 1.1 to 13.0
Moderate effect size high-frequency TENS
Need for additional medication

Systematic review
24 women with primary dysmenorrhoea
Data from 1 RCT
Mean number of additional analgesic tablets taken
6.9 with high-frequency TENS
3.7 with low-frequency TENS

WMD 3.2 tablets
95% CI 0.5 tablets to 5.9 tablets
Randomisation and blinding unclear
Effect size not calculated low-frequency TENS