Table 2

 Hazard ratios of return to work after minimal postal intervention compared to control group, analysed in separate Cox proportional hazards models with length of sick leave as the dependent variable

Modeln total in analysis (censored)*−2 log likelihoodp value unadjusted modelp value adjusted modelHazard ratio (95% CI) unadjustedHazard ratio (95% CI) adjusted†
*Sick leaves were censored if benefits changed to maternity benefits or old age pensions, changed by death, and if sick leave reached 365 days.
†Adjusted: gender, age group, educational level, occupation, and the current diagnostic group.
Total990 (192)9899.50.24<0.0011.09 (0.95 to 1.25)1.07 (0.93 to 1.23)
Low back pain236 (61)1688.10.380.0110.87 (0.65 to 1.18)0.79 (0.58 to 1.08)
Rheumatic disorders and arthritis99 (25)599.30.040.421.62 (1.02 to 2.57)1.57 (0.98 to 2.51)
Other musculoskeletal486 (87)4345.00.99<0.0011.00 (0.82 to 1.22)1.01 (0.83 to 1.24)
Mental disorder169 (19)1323.20.0320.0461.42 (1.03 to 1.96)1.36 (0.98 to 1.89)
Sick leaves 12 weeks or longer
Total332 (142)2023.10.0240.0131.39 (1.04 to 1.85)1.42 (1.06 to 1.92)
Low back pain76 (41)272.00.0400.1350.49 (0.25 to 0.98)0.25 (0.10 to 0.60)
Rheumatic disorders and arthritis45 (23)155.10.290.720.61 (0.24 to 1.55)0.56 (0.21 to 1.49)
Other musculoskeletal155 (59)861.00.001<0.0012.00 (1.30 to 3.08)2.03 (1.30 to 3.19)
Mental disorder55 (18)262.70.0040.0472.54 (1.32 to 4.87)3.96 (1.46 to 6.00)