Thompson 1989.

Methods	Country: UK ‐ Emergency department Randomisation: coin toss Power analysis: Not stated BLINDING: Investigators: Y Participants: No
Participants	No age limit, presumed adult 58 patients, baseline data not given but described as no significant difference Inclusion criteria: diagnosis by IVP, stone passage/removal Exclusion criteria: asthma, trial drug allergy, renal/hepatic impairment, inflammatory bowel disease, prior treatment, pregnancy, lactation
Interventions	Group 1: 100 mg pethidine 'injection', IV or IM not stated Group 2: 100 mg diclofenac PR
Outcomes	Change in pain score but not absolute scores Complete pain relief at 30min Rescue analgesia Adverse events
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	High risk	C ‐ Inadequate