Table 4 Sensitivity and specificity for estimated cut-off values. Correct classification rate in different PROM baseline groups
| Spinal stenosis | Degenerative spondylolisthesis | |||||||
|---|---|---|---|---|---|---|---|---|
| Estimated cut-off |
Correct classification | Sensitivity | Specificity | Estimated cut-off |
Correct classification | Sensitivity | Specificity | |
| ODI follow-up score | ≤24 | 0.83 | 0.80 | ≤24 | 0.85 | 0.84 | ||
| Low baseline | 80% | 87% | ||||||
| Medium | 85% | 85% | ||||||
| High baseline | 80% | 84% | ||||||
| ODI change score | ≥13 | 0.78 | 0.77 | ≥13 | 0.83 | 0.71 | ||
| Low baseline | 72% | 77% | ||||||
| Medium | 84% | 86% | ||||||
| High baseline | 78% | 75% | ||||||
| ODI percentage change | ≥30 | 0.87 | 0.77 | ≥30 | 0.89 | 0.77 | ||
| Low baseline | 83% | 88% | ||||||
| Medium | 85% | 85% | ||||||
| High baseline | 80% | 82% | ||||||
| EQ-5D follow-up score | ≥0.692 | 0.76 | 0.81 | ≥0.692 | 0.80 | 0.88 | ||
| Low baseline | 75% | 81% | ||||||
| Medium | 79% | 80% | ||||||
| High baseline | 80% | 82% | ||||||
| EQ-5D change score | ≥0.105 | 0.77 | 0.68 | ≥0.105 | 0.81 | 0.63 | ||
| Low baseline | 73% | 74% | ||||||
| Medium | 75% | 80% | ||||||
| High baseline | 72% | 71% | ||||||
| Leg pain follow-up score | ≤3 | 0.80 | 0.83 | ≤3 | 0.79 | 0.78 | ||
| Low baseline | 82% | 81% | ||||||
| Medium | 82% | 76% | ||||||
| High baseline | 81% | 79% | ||||||
| Leg pain change score | ≥3 | 0.78 | 0.75 | ≥3 | 0.78 | 0.72 | ||
| Low baseline | 69% | 70% | ||||||
| Medium | 82% | 76% | ||||||
| High baseline | 78% | 80% | ||||||
| Leg pain percentage change | ≥40 | 0.82 | 0.80 | ≥40 | 0.80 | 0.73 | ||
| Low baseline | 79% | 75% | ||||||
| Medium | 81% | 76% | ||||||
| High baseline | 81% | 81% | ||||||
| Back pain follow-up score | ≤4 | 0.84 | 0.79 | ≤4 | 0.85 | 0.79 | ||
| Low baseline | 81% | 82% | ||||||
| Medium | 83% | 80% | ||||||
| High baseline | 82% | 87% | ||||||
| Back pain change score | ≥2 | 0.82 | 0.66 | ≥3 | 0.78 | 0.80 | ||
| Low baseline | 72% | 67% | ||||||
| Medium | 83% | 81% | ||||||
| High baseline | 71% | 83% | ||||||
| Back pain percentage change | ≥33% | 0.81 | 0.79 | ≥33% | 0.83 | 0.78 | ||
| Low baseline | 76% | 78% | ||||||
| Medium | 83% | 80% | ||||||
| High baseline | 80% | 85% | ||||||