Lehtonen 1983.

Methods	Country: Finland ‐ Hospital presentations Randomisation: Not stated Power analysis: Not stated BLINDING: Investigators: Not stated Participants: Not stated
Participants	No age limits, presumed adult Group 1: 93 (69M), Mean age 44.6 y Group 2: 31 (26M), Mean age 39.5 y Inclusion criteria: diagnosis by clinical, UA and IVP Exclusion criteria: asthma, known allergy, peptic ulcer, pregnancy, prior treatment
Interventions	Group 1: 50 mg indomethacin IV Group 2: 50 mg pethidine IV
Outcomes	Complete pain relief at 30 min Need for rescue analgesia Adverse events
Notes	3rd study arm not included because of drug type (dipyrone)
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	High risk	C ‐ Inadequate