Sunshine 1988.

Methods	Study 1. Randomised, double blind, 3 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 6 hours
Participants	Various surgical procedures including cholecystectomy, appendectomy and gynaecological operations N = 151 M = 6, F = 145 Mean age 39 years
Interventions	Codeine 60 mg, n = 51 Piroxicam 20 mg, n = 50 Placebo, n = 50
Outcomes	PI: standard 4 point scale PR: standard 5 point scale Use of rescue medication Adverse events Withdrawals
Notes	Oxford Qualtiy Score: R1, DB1, W1. Total = 3 Rescue medication available on request
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	Unclear risk	Not described