Table 3.
Association between factors specific to episode and persistent low back pain (univariate analysis)
| Characteristic | Persistent low back pain
|
Odds ratio (95% CI) | |
|---|---|---|---|
| No (n=119) | Yes (n=61) | ||
| Duration of pain before current visit (weeks)*: | |||
| 0-3 | 95 | 40 | 1 |
| 4-12 | 20 | 12 | 1.43 (0.6 to 3.2) |
| ⩾13 | 4 | 9 | 5.34 (1.6 to 18) |
| Radiating leg pain*: | |||
| No | 54 | 15 | 1 |
| Yes | 65 | 46 | 2.55 (1.3 to 5.1) |
| Widespread pain*: | |||
| No | 110 | 40 | 1 |
| Yes | 9 | 21 | 6.42 (2.7 to 15) |
| Usual duration of low back pain (days)*: | |||
| <7 | 31 | 17 | 1 |
| 7-30 | 34 | 21 | 1.01 (0.4 to 2.4) |
| >30 | 15 | 16 | 1.65 (0.6 to 6.7) |
| Standing extension*: | |||
| Not restricted | 37 | 9 | 1 |
| Restricted | 71 | 39 | 2.26 (0.9 to 5.2) |
| Finger to floor*: | |||
| Not restricted | 67 | 12 | 1 |
| Restricted | 46 | 37 | 4.49 (2.1 to 9.5) |
| Lateral flexion*: | |||
| Not restricted | 82 | 28 | 1 |
| Restricted | 33 | 23 | 2.04 (0.9 to 4.0) |
| Modified Schober’s*: | |||
| Not restricted | 95 | 33 | 1 |
| Restricted | 18 | 17 | 2.72 (1.3 to 5.9) |
| Knee extension*: | |||
| Not restricted | 51 | 16 | 1 |
| Restricted | 36 | 27 | 2.39 (1.1 to 5.1) |
*
Odds ratios adjusted for sex and age (four groups).