Fracture prevalence at presentation according to duration of back pain
| Duration of pain (months) | Group 1 (idiopathic) | Group 2 (secondary) | Group 3 (corticosteroid) |
| 0–6 | 2.37 (1.98) | 1.64 (0.92) | 3.15 (2.41) |
| 6–12 | 2.67 (1.92) | 3.60 (1.96) | 1.50 (0.84) |
| 12–24 | 1.86 (0.90) | 1.67 (1.12) | 2.29 (1.11) |
| 24–60 | 1.20 (0.45) | 3.50 (3.39) | 3.00 (2.83) |
| >60 | 3.50 (2.02) | 3.40 (3.29) | 2.25 (1.50) |
Data shown as mean (SD).