Wilson 1994.

Methods	Randomised clinical trial.
Participants	Country: England. Number randomised: 55. Post‐randomisation drop‐outs: 6 (10.9%). Revised sample size: 49. Mean age: 48 years. Females: 40 (81.6%). Inclusion criteria: People undergoing laparoscopic cholecystectomy. Exclusion criteria: Peptic ulcer disease. Hepatic or renal insufficiency. History of haemorrhagic diathesis. Hypersensitivity to diclofenac.
Interventions	Participants were randomly assigned to 1 of 2 groups. Group 1: diclofenac 75 mg IM (n = 26). Group 2: placebo (n = 23).
Outcomes	Pain.
Notes	Reasons for post‐randomisation drop‐outs: incomplete data extraction (n = 3), conversion to open (n = 3). Attempts were made to contact authors in August 2013.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "Computer random number generation".
Allocation concealment (selection bias)	Unclear risk	Comment: This information was not available.
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Quote: "Pharmacy provided identical pre‐packed syringes".
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Comment: This information was not available.
Incomplete outcome data (attrition bias) All outcomes	High risk	Comment: There were post‐randomisation drop‐outs.
Selective reporting (reporting bias)	High risk	Comment: Mortality and morbidity were not reported.
For‐profit bias	Unclear risk	Comment: This information was not available.