Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Pain
RCT Crossover design 3-armed trial	32 women In review	Proportion of women experiencing pain relief 14/32 (44%) with high-frequency TENS 24/32 (75%) with ibuprofen	OR 0.26 95% CI 0.09 to 0.75	Moderate effect size	ibuprofen