Milgrom 1993.

Methods	RCT; randomisation according to their military identification numbers Follow‐up time: 10 weeks
Participants	Population and setting: 70 male infantry recruits with over exertion back pain, 32 with thoracic and 40 with lumbar pain, mean age 18 years Inclusion criteria: no history of back pain, no back trauma, back pain exertionally related to carrying loads on the back, not present or markedly improved on non‐exertional activities, no sciatica, no sudden onset
Interventions	NSAID (i): ibuprofen 800 mg t.i.d., 7 days (N = 24) Reference treatment (ii): paracetamol 1000 mg t.i.d., 7 days (N = 24) Reference treatment (iii): no drug treatment (N = 22)
Outcomes	% participants cured after 10 weeks, adverse events
Notes	1. Not LBP, but both lumbar and thoracic pain, no distinction made 2. We contacted the corresponding author to ask for clarification (21 September 2019)