Chantler 2009.

Methods	Randomisation/allocation method unclear Double‐blind, cross‐over study 12 women randomised and analysed
Participants	Inclusion: history of moderate to severe primary dysmenorrhoea, otherwise healthy Exclusion: chronic medication or hormonal contraception in the previous 12 months, secondary dysmenorrhoea Age: 20 years Source: university students Location: South Africa
Interventions	Diclofenac (100 mg) Placebo 1 dose of each before exercise on first or second day of menstruation while experiencing worst menstrual pain
Outcomes	Pain on VAS
Notes	Study includes exercise‐related interventions and outcomes also
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Method not described
Allocation concealment (selection bias)	Unclear risk	Method not described
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Double‐blinded, using identical‐looking placebo capsule
Selective reporting (reporting bias)	Unclear risk	Unclear whether data on adverse effects prospectively solicited
Complete follow‐up?	Low risk	Yes
Potential bias related to study funding	Low risk	Academic funding only