Sanyal 2014.

Methods	Prospective, randomized, double‐blind study, parallel‐group, active control x 24 h
Participants	Type of surgery: elective total abdominal hysterectomy with or without bilateral salpingo‐oophorectomy Paracetamol group Entered/completing: not stated Age (mean, SD): not stated Sex (male, %): 0 Diclofenac group Entered/completing: not stated Age (mean, SD): not stated Sex (male, %): 0
Interventions	Paracetamol: 1 g IV postoperatively every 8 h x 24 h Diclofenac: 75 mg IM every 8 h x 24 h
Outcomes	Primary: requirement of rescue analgesic (time component not described) Secondary: VAS (scale not mentioned) for pain at least at 4 and 12 h postoperatively, time until first rescue analgesic administration, patient satisfaction score (scale not mentioned), nausea, vomiting, bronchospasm
Source of funding	None mentioned
Were treatment groups comparable at baseline?	Not described
Details of preoperative pain	Not described
Notes	—
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	No information
Allocation concealment (selection bias)	Unclear risk	No information
Blinding (performance bias and detection bias) All outcomes	Unclear risk	No information
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Unclear how many participants completed the study or what method of analysis was used
Selective reporting (reporting bias)	High risk	No data reported
Size	High risk	Fewer than 50 participants per arm of the study