Table 1 Sensitivity, specificity, PPV and NPV for CURB-65 and CURB-age criteria in 189 patients with CAP

	CURB-65 estimate (95% CI)	CURB-age estimate (95% CI)
Sensitivity	81.5% (61.9 to 93.7)	81.5% (61.9 to 93.7)
Specificity	64.2% (56.3 to 71.6)	74.1% (66.6 to 80.6)
PPV	27.5% (18.1 to 38.6)	34.4% (22.9 to 47.3)
NPV	95.4% (89.6 to 98.5)	96.0% (90.9 to 98.7)

PPV, positive predictive value; NPV, negative positive value; CAP, community acquired pneumonia.