Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Pain
Systematic review	556 Indian adolescents attending school with moderate to very severe primary dysmenorrhoea Data from 1 RCT	Proportion of women with no pain after 60 days and before crossover 142/277 (51%) with thiamine 100 mg daily for 90 days 0/279 (0%) with placebo for 60 days	NNT 2 95% CI 2 to 3	Effect size not calculated	thiamine