Table 2

 Characteristics of study patients

Intervention group(n = 247)Control group(n = 253)
QBPDS, Quebec Back Pain Disability Scale (0–100: higher score means more disabilities); NRS, Numerical Rating Scale (0–10: higher score means more pain).
*Missing values (8 and 15, respectively).
Mean (SD) age (years)46.2 (14.8)44.4 (13.3)
Sex: no (%) female132 (53.4%)127 (50.2%)
No (%) with paid job171 (69.1%)193 (77.0%)
Duration of current episode*: no (%)
    <3 weeks85 (35.6%)74 (29.2%)
    4–12 weeks76 (31.8%)93 (39.1%)
    >12 weeks78 (32.6%)71 (29.8%)
Mean (SD) baseline functioning(QBPDS) score39.3 (17.9)41.0 (18.6)
Mean (SD) baseline pain intensity(NRS) score6.3 (2.1)6.4 (2.1)
Baseline sick leave due to back pain (% yes)46.643.2