Performance of the score systems Acute Physiology and Chronic Health Evaluation II and III at an interdisciplinary intensive care unit, after customization

Table 5 Discrimination and calibration of APACHE III before and after customization for various subgroups of the validation sample

Subgroup	Prediction	n	ROC area	H	C	SMR (95% CI)
Medical	Original	590	0.861	22.01^†	24.90^†	1.15 (1.01-1.29)
	Customized		0.861	15.83^*	18.27^*	0.93 (0.81-1.06)
Surgical	Original	299	0.842	8.51	13.18	1.28 (0.96-1.60)
	Customized		0.842	4.75	7.62	0.98 (0.71-1.25)
< 65 years	Original	464	0.894	16.62^*	15.59^*	1.19 (0.95-1.42)
	Customized		0.894	21.24^†	10.19	0.94 (0.74-1.14)
≥ 65 years	Original	425	0.812	13.63	15.74^*	1.17 (1.02-1.33)
	Customized		0.812	12.93	9.42	0.95 (0.81-1.08)
Direct admission	Original	614	0.874	19.41^*	23.46^†	1.29 (1.10-1.48)
	Customized		0.874	9.07	11.67	1.02 (0.86-1.18)
Transferral	Original	275	0.817	9.54	12.18	1.05 (0.87-1.23)
	Customized		0.817	15.80^*	15.18^*	0.86 (0.70-1.01)
Cardiovascular	Original	317	0.890	16.72^*	19.21^*	1.11 (0.92-1.35)
	Customized		0.890	18.47^*	15.61^*	0.90 (0.74-1.07)
Gastrointestinal	Original	296	0.887	8.17	5.56	1.08 (0.81-1.34)
	Customized		0.887	7.80	5.26	0.85 (0.62-1.08)

Direct admission is defined as admission from emergency room, operating theatre, or recovery room; and transferral is defined as admission from other hospital, other ICU, or floor. C, Hosmer-Lemeshow goodness-of-fit C test; H, Hosmer-Lemeshow goodness-of-fit H test; CI, confidence interval. ^*P < 0.05, ^†P = 0.01.

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