Table 1 Baseline population characteristics (n = 201)
Characteristics | Continued to final follow-up (n = 107) | Lost to follow-up (n = 94) | |
|---|---|---|---|
Sex | Male | 62 (57.9) | 57 (60.6) |
Female | 45 (42.1) | 37 (39.4) | |
Age in years | M (SD) | 41.01 (9.51) | 38.8 (10.57) |
Education | Primary | 43 (40.2) | 43 (45.7) |
Secondary | 40 (37.4) | 29 (30.9) | |
University | 13 (12.1) | 16 (17) | |
Not specified | 11 (10.3) | 6 (6.4) | |
Work status at baseline | Full-time job | 10 (10.6) | 10 (11.8) |
On sick leave | 74 (78.7) | 54 (63.5) | |
Unemployed | 3 (3.3) | 8 (9.4) | |
On social welfare | 7 (7.4) | 13 (15.3) | |
Missing | 13 | 9 | |
Type of work activity at baseline | Intellectual | 15 (15.6) | 15 (16.9) |
Physical | 52 (54.2) | 54 (60.7) | |
Both | 29 (30.2) | 20 (22.5) | |
Missing | 11 | 5 | |
Duration of incapability to work at baseline | < 7 weeks | 10 (9.3) | 9 (9.6) |
7 weeks–3 months | 10 (9.3) | 6 (6.3) | |
3–6 months | 17 (15.9) | 14 (14.8) | |
6–18 months | 32 (29.9) | 31 (33.1) | |
> 18 months | 13 (12.1) | 12 (12.8) | |
Not applicable | 25 (23.5) | 22 (23.4) | |
Length of current incapability to work | < 7 weeks | 6 (6.6) | 4 (4.8) |
7 weeks–3 months | 7 (7.8) | 7 (8.4) | |
3–6 months | 12 (13.3) | 6 (7.2) | |
6–18 months | 34 (37.8) | 39 (47) | |
> 18 months | 31 (34.4) | 27 (32.5) | |
Missing | 17 | 11 | |
Health status at baseline | BMI, M (SD) | 26.1 (4.15) | 26.5 (5.6) |
Back surgery | 20 (21.9) | 18 (21.9) |