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Accuracy statistics (with 95% confidence interval) for each level of the prediction model
| Number of predictors present | Sensitivity | Specificity | Positive likelihood ratio | Probability of successful traction (%) |
|---|---|---|---|---|
| ≥1 | 0.98 (0.80–1.00) | 0.09 (0.04–0.16) | 1.07 (0.99–1.16) | 20.4 |
| ≥2 | 0.96 (0.78–1.00) | 0.46 (0.36–0.56) | 1.78 (1.47–2.17) | 30.0 |
| ≥3 | 0.76 (0.55–0.90) | 0.75 (0.65–0.83) | 3.04 (2.04–4.53) | 42.2 |
| All 4 | 0.36 (0.19–0.57) | 0.96 (0.90–0.99) | 9.36 (3.13–28.00) | 69.2 |
