Table 3.
Sensitivity, specificity, positive and negative predictive values and Kappa statistic of hospital data Charlson comorbidity index as compared to study data
| Charlson comorbidity index | Sensitivity (95% CI) | Specificity (95% CI) | PPV (%) (95% CI) |
NPV (%) (95% CI) |
Kappa |
|---|---|---|---|---|---|
| 0 (n = 3031) | 88.2 (86.8–89.5) | 87.2 (86.1–88.4) | 82.9 (81.3–84.4) | 91.3 (90.3–92.3) | 0.74 |
| 1–2 (n = 1518) | 83.9 (82.3–85.4) | 70.9 (69.3–72.5) | 66.6 (64.8–68.3) | 86.5 (85.1–87.7) | 0.53 |
| 3–4 (n = 583) | 73.1 (69.6–76.5) | 84.7 (83.6–85.7) | 39.3 (36.6–42.1) | 95.9 (95.2–96.4) | 0.42 |
| 5+ (n = 292) | 67.9 (61.9–73.5) | 93.0 (92.2–93.6) | 32.8 (28.9–36.9) | 98.3 (97.9–98.6) | 0.40 |
Abbreviations: PPV Positive predictive value, NPV Negative predictive value