Aoki 1983.

Methods	RCT; double‐blind. Randomisation procedure not described Follow‐up: 14 days. Outcome measurements after 1 and 2 weeks
Participants	Population: 237 participants Inclusion criteria: adults presenting at clinical centres with principal complaint LBP Exclusion criteria: history of gastrointestinal, hepatic, or renal disease, those with complications or requiring surgery, history of drug allergy, anticoagulants, abnormal baseline laboratory values, pregnancy, nursing mothers and women with childbearing potential.
Interventions	NSAID (i): piroxicam 20 mg capsules, once per day, 14 days (N = 116) NSAID (ii): indomethacin 25 mg capsules, three times per day, 14 days (N = 114)
Outcomes	Global improvement, adverse events
Notes	1. Duration of LBP is not clear (unspecified) 2. We were unable to find contact details to ask for clarification (21 October 2019).