Table 3.
Description of the study sample consisting of 412 40-yr old Danes from the general population
| Sex | |
| Men | 199 |
| Women | 213 |
| LBP some time past yr (LBPyear) | |
| Yes | 284 |
| No | 128 |
| LBP altogether for at least 30 days past yr (LBPlong) | |
| Yes | 102 |
| No | 310 |
| Disc degeneration (DD) | |
| Yes | 214 |
| No | 198 |
| Disc degeneration with signs of marrow changes consistent with a vertebral inflammatory process, type 1 or type 2 lesion (VIP) | |
| Yes | 73 |
| No | 339 |
| Smoking | |
| 0 cigarettes/wk | 169 |
| 1–19 cigarettes/wk | 172 |
| ≥20 cigarettes/wk | 70 |
| missing data | 1 |
| BMI | |
| underweight | 20 |
| normal weight | 214 |
| overweight | 115 |
| heavy overweight | 60 |
| missing data | 3 |
| Work | |
| Mainly sitting | 89 |
| Sitting/walking | 144 |
| Light physical | 92 |
| Hard physical | 84 |
| Missing data | 3 |