Opsahl 2016.

Population (low back pain description; location; setting; data collection period)	Randomized Controlled Trial: Employees with long‐lasting low back pain recruited from 4 clinics; Norway; Occupational; Data collection period not reported
Sample size	286 (women); 283 (men)a
Prognostic factor (type, measure(s) of individual recovery expectations)	GENERAL: To what extent do you think you will return to work? (4 pts)
Notes	Funding Source: The Research Council of Norway Conflict of Interest: None declared aOpsahl 2016a (women) and Opsahl 2016b (men) are same study, presented separately