Table 3.

Thirty-day mortality, sensitivity, specificity, PPV and NPV for different NACA scores

Patient category	n	30-day mortality (n)	Mortality percent (95 % CI)	Sensitivity	Specificity	PPV	NPV
Trauma patients	625	12	1.9% (1.1–3.3)
NACA 1	8	0	0.0% (0.0–32.4)	1.00	1.00	0.02	–
NACA 2	97	0	0.0% (0.0–3.8)	1.00	0.01	0.02	1.00
NACA 3	329	0	0.0% (0.0–1.2)	1.00	0.17	0.02	1.00
NACA 4	129	0	0.0% (0.0–2.9)	1.00	0.71	0.06	1.00
NACA 5	35	1	2.9% (0.5–14.5)	1.00	0.92	0.19	1.00
NACA 6	27	11	40.7% (24.5–59.3)	0.92	0.98	0.41	1.00
Non-trauma patients	908	67	7.4% (5.9–9.3)
NACA 1	11	0	0.0% (0.0–25.9)	1.00	0.00	0.07	–
NACA 2	118	3	2.5% (0.9–7.2)	1.00	0.01	0.07	1.00
NACA 3	333	4	1.2% (0.5–3.0)	0.96	0.15	0.08	0.98
NACA 4	296	17	5.7% (3.6–9.0)	0.90	0.54	0.13	0.98
NACA 5	99	19	19.2% (12.6–28.0)	0.64	0.87	0.29	0.97
NACA 6	51	24	47.1% (34.1–60.5)	0.36	0.97	0.47	0.95

CI, confidence interval; NACA, National Advisory Committee of Aeronautics; NPV, negative predictive value; PPV, positive predictive value.