Kumar 2016.

Methods	Active controlled, parallel group, single dose, single center. Assessments up to 6 h postinterventions. Interventions administered once participants reported moderate pain.
Participants	Type of surgery: elective (no further details) Diclofenac group Entered/completing: 30/30 Age (mean, SD): 36.7 ± 12.9 Sex (male, %): 15, 50% Tramadol group Entered/completing: 30/30 Age (mean, SD): 41.5 ± 15.1 Sex (male, %): 14, 47%
Interventions	Diclofenac: 75 mg in 100 mL of 0.9% sodium chloride, single dose administered over 30 minutes in the recovery room Tramadol: 100 mg in 100 mL 0.9% sodium chloride, as with diclofenac
Outcomes	Time to onset of analgesia (not defined) Duration of analgesia (not defined) Vital signs Adverse events
Notes	States that participants were blinded, but no mention of investigator blinding. Authors did not reply to request for clarification.