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

RCT
4-armed trial
84 women with moderate or greater pain in at least 4 of their last 6 cycles who experienced pain relief with non-prescription analgesics and had a history consistent with a diagnosis of primary dysmenorrhoea Mean pain relief score after 2 days of treatment from the start of menses
3.27 with abdominal heated (to 38.9 °C) patch for about 12 hours daily plus placebo
1.95 with unheated patch plus placebo

P <0.001
Effect size not calculated heated patch plus placebo

RCT
4-armed trial
84 women with moderate or greater pain in at least 4 of their last 6 cycles who experienced pain relief with non-prescription analgesics and had a history consistent with a diagnosis of primary dysmenorrhoea Mean pain intensity reduction after 2 days of treatment from the start of menses
40.4 with abdominal heated (to 38.9 °C) patch for about 12 hours daily plus placebo
21.9 with unheated patch plus placebo

P <0.003
Effect size not calculated heated patch plus placebo