Table 3 Performance of the PIRO staging system for predicting hospital survival in each stage
Stage I (n = 431) | Stage II (n = 510) | Stage III (n = 601) | Stage IV (n = 96) | |
|---|---|---|---|---|
Sensitivity, 95% CI | 30% (28–33) | 62% (59–65) | 95% (83–86) | 5% (4–6) |
Specificity, 95% CI | 95% (91–97) | 66% (60–72) | 12% (9–17) | 88% (83–91) |
Negative likelihood ratio, 95% CI | 0.7 (0.7–0.8) | 0.6 (0.5–0.6) | 0.4 (0.3–0.6) | 1.1 (1.0–1.1) |
Positive likelihood ratio, 95% CI | 5.9 (3.5–9.9) | 1.8 (1.5–2.2) | 1.1 (1.0–1.1) | 0.4 (0.3–0.6) |
Negative predictive value, 95% CI | 21% (20–21) | 25% (23–27) | 34% (25–43) | 18% (16–20) |
Positive predictive value, 95% CI | 97% (95–98) | 91% (89–92) | 85% (84–86) | 66% (57–75) |