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. 2011 Feb 21;2011:0813.
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