Table 1 Baseline descriptive data for the two study populations.
| Â | Study population | |
|---|---|---|
Characteristic | Primary sector patients (n = 94) | Secondary sector patients (n = 97) |
Age, mean (min., max.) | 44 (18–76) | 47 (20–85) |
Sex, n (%) | Â | Â |
   Male | 44 (47) | 45 (46) |
   Female | 50 (53) | 52 (54) |
Pain location, n (%) | Â | Â |
   Low back only* | 70 (75) | 28 (29) |
   Leg pain (+/- LBP) | 24 (25) | 69 (71) |
Duration of current problem, n (%) | Â | Â |
   ≤ 30 days | 69 (73) | 12 (12) |
   > 30 days | 23 (24) | 79 (81) |
   Missing | 2 (2) | 6 (6) |
Use of pain medication†, n (%) |  |  |
   ≤ a couple of times a week | 59 (63) | 39 (40) |
   > a couple of times a week | 33 (35) | 58 (60) |
   Missing | 2 (2) | - |
Disability at baseline 0–100 scale, mean (SD) |  |  |
   ODI | 27.4 (16.2) | 33.7 (14.5) ‡ |
   RMQ | 40.3 (18.5) | 45.2 (16.3) |
   LBPRSdisability | 33.6 (17.8) | 45.2 (17.8) ‡ |
   SF36 (pf) | 34.9 (25.0) | 45.7 (20.3) ‡ |
Pain at baseline, 0–100 scale (mean, SD) |  |  |
   LBPRSpain | 37.4 (21.1) | 47.7 (22.5) ‡ |
   SF36 (bp) | 64.9 (20.2) | 64.0 (20.5) |
   NRSpain over the past week | 43.3 (23.2) | 48.6 (25.3) |