Higher mortality risk among injured individuals in a population-based matched cohort study

BMC Public Health

Table 1 Demographic and health service use characteristics of injury-related hospitalisations of individuals aged 18+ years and matched non-injured comparison cohort in 2009, co-morbidity and mortality data in Australia

Characteristic	Injury cohort (n = 166,589)		Non-injured comparison cohort (n = 166,589)
	n	%	n	%
Australian state
New South Wales	90,833	54.5	90,833	54.5
Queensland	58,833	35.3	58,833	35.3
South Australia^a	16,923	10.2	16,923	10.2
Gender
Male	94,939	57.0	94,939	57.0
Female	71,650	43.0	71,650	43.0
Age group
18–24	23,350	14.0	23,350	14.0
25–34	26,395	15.8	26,395	15.8
35–44	24,168	14.5	24,168	14.5
45–54	21,452	12.9	21,452	12.9
55–64	17,642	10.6	17,642	10.6
65–74	14,322	8.6	14,322	8.6
75–84	19,862	11.9	19,862	11.9
85+	19,398	11.6	19,398	11.6
Location of residence
Urban	108,309	65.0	108,309	65.0
Rural	58,280	35.0	58,280	35.0
Pre-existing health service use
Number of emergency department presentations in the 12 months prior to the index injury date	152,183	-	40,469	-	-
Number of hospital admissions in 12 months prior to the index injury date	153,200	-	66,766	-	-
Total hospital length of stay prior to the index injury date (days)	759,287	-	277,099	-	-
Charlson comorbidity conditions					χ ² (df)
0	140,748	84.5	157,930	94.8	10004.4 (2)*
1–2	21,567	13.0	8145	4.9
≥3	4274	2.6	514	0.3
Other health conditions
Mental health diagnoses^b	10,390	6.2	1498	0.9	6897.1 (1)*
Alcohol misuse and dependence	12,560	7.5	727	0.4	10975.8 (1)*
Drug-related dependence	3165	1.9	369	0.2	2235.8 (1)*

*p < 0.0001
^a Includes people hospitalised in public hospitals in South Australia only. ^b Includes depression, schizophrenia, bipolar and anxiety disorders

ISSN: 1471-2458