Table 6

 Prognostic factors for duration of sick leave due to low back pain related to work

Prognostic factorPooled ES (95% CI)+ adjusted for quality+ adjusted for non-report of ES
–, pooling not possible; ES, effect size.
Heavy work (ref: light)23–26,31–33,35,361.40 (1.26 to 1.56)1.40 (1.27 to 1.55)1.39 (1.25 to 1.55)
Regularly work more than 8 hour shifts24,35,361.36 (0.97 to 1.92)
Work unsociable hours (ref: no)241.13 (0.82 to 1.56)
Time sitting per day (ref: no)24
    <50%0.96 (0.68 to 1.34)
    >75%1.38 (0.75 to 2.19)
Posture index31,321.16 (0.93 to 1.45)
Vibration perceived24,31–331.67 (0.99 to 2.81)1.98 (0.89 to 4.43)
Time driving per day (ref: no)24
    <50%0.85 (0.60 to 1.21)
    >75%1.82 (1.03 to 3.22)
Work tempo and quantity35,361.11 (1.00 to 1.37)