Table 4 Results of the responsiveness analysis: a comparison of two groups
Good outcome group | Poor outcome group | ||||||
|---|---|---|---|---|---|---|---|
Baseline median (IQR) | Post-surgery median (IQR) | Median change (IQR) | Baseline median (IQR) | Post-surgery median (IQR) | Median change (IQR) | Mann-Whitney U test | |
Back pain (0–10) | 7.0 (3.0) | 3.0 (3.0) | − 3.0 (4.0) | 7.0 (3.0) | 6.0 (3.0) | − 1.0 (2.0) | Z = − 3.26, p = .001 |
Leg pain (0–10) | 7.0 (3.0) | 3.0 (5.0) | −3.0 (5.0) | 8.0 (2.2) | 6.0 (3.0) | − 1.0 (3.3) | Z = − 3.53, p < .001 |
Worst pain (0–10) | 8.0 (2.0) | 4.0 (3.0) | − 3.0 (4.0) | 8.0 (2.0) | 7.0 (2.0) | − 1.0 (2.0) | Z = − 4.63, p < .001 |
Function (1–5) | 4.0 (1.0) | 3.0 (2.0) | −1.0 (2.0) | 4.0 (1.2) | 3.5 (1.0) | −0.5 (1.0) | Z = − 3.17, p = .002 |
Symptom-specific well-being (1–5) | 5.0 (0.0) | 4.0 (3.0) | − 1.0 (3.0) | 5.0 (0.0) | 5.0 (1.0) | 0.0 (1.0) | Z = − 3.51, p < .001 |
Quality of life (1–5) | 4.0 (2.0) | 3.0 (1.0) | − 1.0 (2.0) | 4.0 (1.3) | 3.5 (1.0) | 0.0 (1.0) | Z = − 4.59, p < .001 |
Social disability (1–5) | 4.0 (2.0) | 2.0 (3.0) | − 1.0 (2.0) | 4.0 (2.0) | 4.0 (2.0) | 0.0 (1.3) | Z = − 2.87, p = .004 |
Work disability (1–5) | 2.0 (4.0) | 1.0 (3.0) | 0.0 (1.0) | 3.0 (4.0) | 3.0 (4.0) | 0.0 (2.0) | Z = −1.23, p = .218 |
Overall COMI score (0–10) | 7.9 (2.6) | 4.4 (3.6) | −2.6 (3.3) | 7.8 (2.2) | 6.9 (2.3) | −1.0 (2.0) | Z = − 4.66, p < .001 |