Borchgrevink 1998.

Methods	RCT; randomisation procedure not described; blinded outcome assessment
Participants	Acute neck sprain injury caused by car accident , N=201.
Interventions	E: act as usual (no sick leave or collar) (n=96) C: rest and immobilisation for 14 days with cervical collar (n=105) All: instructions and NSAIDs. Follow‐up 6 weeks and 6 months.
Outcomes	Subjective symptoms (number), ROM (Cybex), symptom intensity (5‐point Likert), head and neck pain (VAS), global improvement (3‐point Likert).
Notes	14 drop‐out in E; 9 in C
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear