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Table 3 Risk stratification of prediction values of scoring system

From: Clinical prediction score for superficial surgical site infection after appendectomy in adults with complicated appendicitis

Risk classification Scores Outcome Sensitivity (%) Specificity (%) Correctly classify (%) LR+a Posttest probability (95% CI)b
SSI No SSI
Low 1–1.3 21 411 85.4 41.2 8.84 1.453 12.2 (9.0, 15.5)
Moderate 2–2.5 18 74 56.3 83.0 80.7 3.315 24.0 (18.5, 29.5)
High > 2.5 9 10 18.8 98.0 91.0 9.281 46.9 (38.8, 53.9)
  1. Coefficient of constant term in the final model (− 3.70) was omitted for easier understanding and interpretation
  2. aCompared to patients with very low risk (score = 0)
  3. bBased on pretest probability, incidence of SSI, of 8.7%
  4. CI confidence interval, LR likelihood ratio, SSI superficial surgical site infection