Table 1 Missing data, floor and ceiling effects
Core items (scoring) | Median (IQR) | Ceiling effect: best status (%) | Floor effect: worst status (%) |
|---|---|---|---|
Back pain (0–10) | 7.0 (3.0) | 4.8 | 7.1 |
Leg pain (0–10) | 7.0 (3.0) | 13.0 | 6.5 |
Function (1–5) | 4.0 (1.0) | 0.8 | 38.5 |
Symptom-specific well-being (1–5) | 5.0 (0.0) | 0.3 | 78.8 |
Quality of life (1–5) | 4.0 (2.0) | 0.0 | 28.3 |
Social disability (1–5) | 4.0 (2.0) | 5.9 | 40.8 |
Work disability (1–5) | 2.0 (4.0) | 46.2 | 30.0 |
Overall COMI score (0–10) | 7.7 (2.4) | 0.0 | 4.5 |