Table 3

Performance of the three scoring systems for subgroups

		Area under ROC curve (95% CI)			Hosmer-Lemeshow p
	n	Pre-ICU PRISM	PIM	PRISM II	Pre-ICU PRISM	PIM	PRISM II
For n<300 the Hosmer-Lemeshow calculations were performed using quintiles, rather than deciles of risk.
ROC, receiver operating characteristic; CI, confidence interval.
Hospital
A	592	0.83 (0.77 to 0.90)	0.87 (0.81 to 0.92)	0.87 (0.81 to 0.93)	<0.005	0.013	0.18
B	336	0.86 (0.75 to 0.96)	0.87 (0.78 to 0.97)	0.84 (0.70 to 0.97)	<0.001	<0.005	0.34
Age (months)
<1	92	0.80 (0.66 to 0.94)	0.79 (0.62 to 0.96)	0.85 (0.72 to 0.98)	0.02	0.11	0.27
1–12	338	0.71 (0.58 to 0.84)	0.79 (0.68 to 0.90)	0.84 (0.75 to 0.94)	<0.001	0.02	0.06
>12	498	0.89 (0.83 to 0.95)	0.92 (0.87 to 0.97)	0.88 (0.80 to 0.95)	<0.001	0.002	0.20
Stabilisation times
<2 hours	528	0.84 (0.78 to 0.92)	0.86 (0.80 to 0.92)	0.86 (0.79 to 0.94)	<0.001	0.03	0.09
>2 hours	400	0.85 (0.75 to 0.95)	0.85 (0.75 to 0.98)	0.85 (0.72 to 0.97)	<0.001	<0.01	0.10
Diagnosis
Respiratory	362	0.67 (0.54 to 0.80)	0.79 (0.69 to 0.90)	0.72 (0.56 to 0.87)	0.02	0.007	0.001
Sepsis	277	0.90 (0.85 to 0.96)	0.89 (0.83 to 0.95)	0.94 (0.90 to 0.98)	<0.001	0.05	0.05
Neurological	131	0.97 (0.94 to 1.00)	0.89 (0.70 to 1.00)	0.90 (0.73 to 1.00)	0.03	0.08	0.20
Other	158	0.80 (0.68 to 0.93)	0.84 (0.74 to 0.95)	0.85 (0.77 to 0.94)	<0.001	0.08	0.38