Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Quality of life
RCT Crossover design	26 women with primary dysmenorrhoea	Menstrual Distress Questionnaire total score 25.4 with TENS for 1 cycle 27.4 with sham TENS for 1 cycle	P = 0.079		Not significant
RCT Crossover design	26 women with primary dysmenorrhoea	Short-Form (SF)-36 questionnaire with TENS for 1 cycle with sham TENS for 1 cycle	No significant difference in any subcategory score P = 0.173 to 0.992		Not significant