Sunshine 1987.

Methods	Randomised, double blind, 5 parallel groups. Single oral dose Medication administered when baseline pain reached a moderate to severe intensity Pain assessed at 0, 30, 60 mins, then hourly to 4 hours
Participants	Episiotomy, Cesarian section or gynaecological operations N = 195 All F Mean age 26 years
Interventions	Codeine 60 mg, n = 37 Ibuprofen 40mg, n = 38 Ibuprofen + Codeine 400/60 mg, n = 40 Ibuprofen + Codeine 200/30 mg, n = 40 Placebo, n = 40
Outcomes	PI: standard 4 point scale PR: standard 5 point scale Use of rescue medication Adverse events Withdrawals
Notes	Oxford Qualtiy Score: R1, DB2, W1. Total = 4 Rescue medication allowed after 1 hour
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Unclear risk	Not described
Allocation concealment?	Unclear risk	Not described
Blinding? All outcomes	Low risk	"All unit doses were identical in appearance and packaging"