Table 1.
Characteristics of participants with no, resolving, developing, and persistent high intensity back pain
| Baseline characteristics | High intensity low back pain | |||
|---|---|---|---|---|
| No (n = 84) | Resolving (n = 13) | Developing (n = 11) | Persistent (n = 15) | |
| Age (years) | 49.0 (8.2) | 42.6 (10.6) | 50.9 (6.6) | 50.1 (7.7) |
| Gender (n, % female) | 64 (76.2) | 10 (76.9) | 10 (90.9) | 12 (80.0) |
| BMI (kg/m2) | 29.7 (7.5) | 36.5 (7.5) | 37.0 (9.5) | 36.4 (7.9) |
| SF-36 mental component summary score | 48.9 (11.7) | 42.1 (15.6) | 42.0 (16.9) | 40.5 (15.0) |
| Strenuous physical activity for > 20 min (over 14-day period) (n, %) | 70 (83.3) | 9 (69.2) | 9 (81.8) | 7 (46.7) |
| Fat mass (kg) | ||||
| Total | 31.6 (16.1) | 46.4 (16.4) | 45.7 (14.6) | 43.1 (14.6) |
| Trunk | 16.5 (8.4) | 25.1 (8.2) | 24.1 (7.2) | 23.0 (8.1) |
| Upper limb | 3.0 (1.7) | 4.3 (2.1) | 4.5 (1.9) | 4.3 (1.6) |
| Lower limb | 11.2 (6.4) | 15.9 (7.0) | 16.1 (5.8) | 14.8 (6.0) |
| Android | 2.9 (1.6) | 4.5 (1.7) | 4.2 (1.5) | 4.2 (1.8) |
| Gynoid | 5.8 (2.6) | 8.0 (2.9) | 8.0 (2.3) | 7.7 (2.4) |
| Android to gynoid ratio (%) | 48.6 (16.2) | 58.3 (14.2) | 52.5 (8.4) | 54.2 (17.8) |
| Lean tissue mass (kg) | ||||
| Total | 46.8 (9.5) | 51.9 (11.7) | 48.1 (10.2) | 49.0 (12.2) |
| Upper limb | 5.1 (1.4) | 5.7 (1.4) | 5.0 (1.3) | 5.5 (1.9) |
| Lower limb | 15.4 (3.4) | 17.1 (3.4) | 15.6 (3.1) | 15.7 (4.5) |
| Total body fat to lean mass ratio | 0.7 (0.3) | 0.9 (0.3) | 0.9 (0.2) | 0.9 (0.3) |
Mean (SD) unless otherwise noted
BMI body mass index, SF-36 Short Form 36