Table 1.
Characteristics in 1996 | Follow-up cohort (actively working participants, n = 360) | Retired or dropout due to non-response (n = 465) |
---|---|---|
Age (years), mean ± SD | 35.7 ± 5.4 | 41.6 ± 9.0 |
Age group [n (%)] | ||
<30 | 46 (13) | 60 (13) |
30‒40 | 219 (61) | 130 (28) |
>40 | 95 (26) | 275 (59) |
Work experience (years) mean ± SD | 12.3 ± 5.3 | 17.3 + 8.2 |
Working hours [n (%)] | ||
24-h shift work | 265 (74) | 375 (81) |
Other kind of shift work | 62 (17) | 58 (13) |
Regular daytime work | 24 (7) | 22 (5) |
Other | 8 (2) | 7 (1) |
Sleep disturbances [n (%)] | ||
None | 208 (58) | 235 (51) |
Mild | 137 (38) | 194 (42) |
Severe | 14 (4) | 33 (7) |
Radiating low back pain [n (%)] | 53 (16) | 77 (19) |
Local low back pain [n (%)] | 95 (28) | 111 (26) |
Musculoskeletal pain in body parts other than back [n (%)] | 207 (58) | 265 (58) |
Smoking [n (%)] | ||
Never smoker | 74 (21) | 75 (16) |
Ex-smoker | 117 (33) | 112 (24) |
Current smoker | 168 (47) | 277 (60) |
Physical workload sum index (0–12) [n (%)] | ||
<6 | 121 (34) | 132 (29) |
6‒7 | 140 (39) | 186 (42) |
8‒12 | 97 (27) | 129 (29) |
Number of work accidents during last 3 years [n (%)] | ||
0 | 43 (20) | 47 (19) |
1 | 61 (28) | 74 (29) |
2 | 51 (24) | 61 (24) |
>2 | 60 (28) | 71 (28) |
Psychosocial job demands sum index (0‒16) [n (%)] | ||
None (0) | 108 (30) | 113 (24) |
Few (1‒4) | 193 (54) | 226 (49) |
Some (5‒8) | 48 (13) | 101 (22) |
Many/very many (9‒16) | 11 (3) | 22 (5) |