Criteria | Sensitivity | Specificity | PPV | NPV |
CU7RB-65 | 81.5 (61.9–93.7) | 65.1 (57.3–72.3) | 27.5 (18.1–38.6) | 95.6 (90.0–98.5) |
CU9RB-65 | 66.7 (46.0–83.5) | 73.5 (66.1–80.0) | 29.0 (18.2–41.9) | 93.1 (87.4, 96.8) |
CU11RB-65 | 63.0 (42.4–80.6) | 78.3 (71.3–84.3) | 32.1 (19.9–46.3) | 92.9 (87.3–96.5) |
CU13RB-65 | 55.6 (35.3–74.5) | 81.3 (74.6–86.9) | 32.6 (19.5–48.0) | 91.8 (86.2–95.7) |
Data are expressed as % (95% confidence interval). PPV: positive predictive value; NPV: negative predictive value; CURB: confusion, urea, respiratory rate ≥30·min−1, low systolic (<90 mmHg) or diastolic (≤60 mmHg) blood pressure. #: the urea cut-off points were >7, >9, >11 and >13 mmol·L−1. n = 193.