Slaven 1998.

Methods	Single‐blind, randomised, placebo controlled trial. Randomisation method: not stated. Number of patients withdrew from study unclear. No details about intention to treat analysis or power calculation.
Participants	20 (16 males, 4 females) patients undergoing elective laminectomies. Exclusions: not stated
Interventions	Rx: tenoxicam 40 mg IV bolus before induction Pl: normal saline 5 mL IV bolus before induction
Outcomes	Pre‐operative and post‐operative creatinine clearance.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear