TABLE 5.

Performance per age group.

			PRISM III			PIM III
Group	Number of patients	Observed mortality, N (%)	Standardized mortality ratio (95% CI)	ROC curve		Standardized mortality ratio (95% CI)	ROC curve
				AUC (95% CI)	P-value		AUC (95% CI)	P-value
≤12M	991	94 (9.49%)	3.96 (3.16–4.76)	0.79 (0.74–0.84)	<0.001	3.42 (2.73–4.12)	0.76 (0.71–0.81)	<0.001
>12 to≤60 M	1,205	71 (5.89%)	2.27 (2.00–2.54)	0.81 (0.76–0.87)	<0.001	2.34 (2.06–2.62)	0.81 (0.75–0.86)	<0.001
>60 to ≤120 M	724	32 (4.42%)	2.23 (1.84–2.62)	0.87 (0.82–0.93)	<0.001	2.19 (1.80–2.57)	0.83 (0.76–0.89)	<0.001
>120 M	476	25 (5.25%)	1.61 (1.29–1.93)	0.81 (0.73–0.90)	<0.001	2.96 (2.37–3.56)	0.82 (0.76–0.88)	<0.001
Total	3,396	222 (6.54%)	2.61 (2.44–2.79)	0.81 (0.79–0.84)	<0.001	2.75 (2.56–2.93)	0.80 (0.78–0.82)	<0.001

The P-value corresponding to χ2 was calculated as (observed deaths − expected deaths)²/expected deaths with one degree of freedom. AUC, Area Under the Curve; CI, confidence interval; PIM, Pediatric Index of Mortality; PRISM, Pediatric Risk of Mortality; ROC, receiver operating characteristic.