| Duration of back pain episode, % |
| < 3 wk | 26.1 |
| 3 wk–3 mo | 15.6 |
| 3 mo–1 y | 11.6 |
| > 1 y | 46.7 |
| Roland–Morris disability score(0–24 scale) |
| ≤ 5, % | 17.5 |
| 6–10, % | 31.6 |
| 11–15, % | 27.9 |
| > 15, % | 23.1 |
| Mean (SD) | 10.9 (5.4) |
| Median | 11 |
| Most severe low back pain in past week (0–10 scale) |
| Mean (SD) | 6.7 (2.1) |
| Median | 7 |
| Average low back pain in past week (0–10 scale) |
| Mean (SD) | 4.6 (1.9) |
| Median | 5 |
| Days with restricted activity owing to low back pain in past month |
| Mean (SD) | 6.9 (8.0) |
| Median | 4 |
| At least 1, % | 76.9 |
| History of low back pain episodes, % |
| Yes | 82.2 |
| No | 17.8 |
| SF-36 physical functioning score |
| Mean (SD) | 62.2 (24.6) |
| Median | 65 |
| SF-36 role limitations score: physical problems |
| Mean (SD) | 41.3 (40.1) |
| Median | 25 |
| SF-36 role limitations score: emotional problems |
| Mean (SD) | 70.0 (39.2) |
| Median | 100 |
| SF-36 mental health index score |
| Mean (SD) | 71.2 (16.6) |
| Median | 76 |
| SF-36 general health perceptions score |
| Mean (SD) | 67.8 (18.0) |
| Median | 70 |
