Case mix, outcome and length of stay for admissions to adult, general critical care units in England, Wales and Northern Ireland: the Intensive Care National Audit & Research Centre Case Mix Programme Database

Table 4 Summary of existing international multicentre literature on case mix and outcomes for admissions to critical care units

	Project IMPACT (US) [26]	APACHE III (US) [14]	Brazil APACHE III Study [27]	ENASSG (US/Europe) [22]	EURICUS-I (Europe) [28]
Admissions	40,435	17,440	1734	14,745	10,027
Units	55	42	10	137	89
Mean age	59.9	59	52	57.2	59.3
Male (%)	54.3	44.8	62	59.6	-
Surgical status (%)
Nonsurgical	64.1	57.7	64.2	48.4	55.9
Elective	22.5	33.3	22.7	31.2	24.3
Emergency	13.4	9.0	13.1	19.6	19.8
Risk model	SAPS II	APACHE III	APACHE III	All	SAPS II
Mean probability	-	0.165*	0.204	-	0.223
Mortality (%)
Unit	-	-	29	-	13.9
Hospital	18.2	16.5	34	21.8	20.0
	NICE (Netherlands) [29]	ASDI (Austria) [30]	PAEEC (Spain) [31]	PSSSG (Portugal) [32]	JSICM (Japan) [33]
Admissions	55,016	25,998	12,174	984	5,107
Units	18	31	86	19	33
Mean age	-	62.1	57.7	55.4	58.3
Male (%)	65.1	58.3	68	67.7	64.5
Surgical status (%)
Nonsurgical	23.2	41.5	75.9	68.2	40.8
Elective	65.4	34.1	13.7	19.6	49.4
Emergency	11.4	24.4	10.4	12.2	9.8
Risk model	APACHE II	SAPS II	APACHE III	APACHE II	APACHE III
Mean probability	0.25^†	0.193	0.198	0.335	0.181
Mortality (%)
Unit	13.3^†	-	-	24.5	-
Hospital	20.9^†	17.6	21.2	32.0	18.2

APACHE, Acute Physiology and Chronic Health Evaluation; ASDI, Austrian Center for Documentation and Quality Assurance in Intensive Care Medicine; ENASSG, European/North American Severity Study Group; EURICUS, European Study of Intensive Care Units; JSICM, Japanese Society of Intensive Care Medicine; NICE, National Intensive Care Evaluation; PAEEC, Project for the Epidemiological Analysis of Critical Care Patients; PSSSG, Portuguese Severity Scores Study Group; SAPS, Simplified Acute Physiology Score; -, not available from published report(s). * Observed and expected mortality are identical as this database represents the development population for the APACHE III model. ^† APACHE II mortality probability and mortality figures reported for 24,329 admissions eligible for APACHE II.

ISSN: 1364-8535