Siddik 2001.

Methods	Randomized, double‐blind, double‐dummy, placebo‐ and active‐controlled Medications administered immediately after surgery
Participants	Type of surgery: cesarean delivery Propacetamol group Entered/completing: 20/20 Age (mean, SD): 31 ± 4.6 Sex (male, %): 0 Diclofenac group Entered/completing: 20/20 Age (mean, SD): 31.4 ± 6 Sex (male, %): 0 Placebo group Entered/completing: 20/20 Age (mean, SD): 30.6 ± 5.1 Sex (male, %): 0
Interventions	Intervention: 2 g propacetamol Control: 100 mg rectal diclofenac Control: combination of 100 mg rectal diclofenac and 2 g propacetamol (not included in our analysis) Placebo: double‐dummy, exact details not described
Outcomes	Opioid consumption (morphine via PCA) Pain intensity at rest and on coughing (VAS 0 to 10) Global assessment (categorical, at 24 h)
Source of funding	Not reported
Were treatment groups comparable at baseline?	Yes: age, weight, height, parity, and gestationaΙ age
Details of preoperative pain	Not reported
Notes	—
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Random number table
Allocation concealment (selection bias)	Unclear risk	Patients and staff were unaware of the patients' group assignment
Blinding (performance bias and detection bias) All outcomes	Low risk	"to ensure blinding of both the parturients and the anaesthesiologist, patients in all groups received both an IV injection and a suppository during the same period"
Incomplete outcome data (attrition bias) All outcomes	Low risk	From 80 patients one was excluded due to technical problems of the PCA device. Data obtained from the 79 remaining patients were used for the analysis of all outcomes and time points.
Selective reporting (reporting bias)	Low risk	All outcomes from Methods section reported in Results section
Size	High risk	Fewer than 50 participants per arm of the study (20 propacetamol, 20 diclofenac, 20 placebo)