Table 3

Multivariate analysis of total cost within the data set across expert consensus-chosen variables

		Cost ratio	SE	z	P value	95% CI	F interval
Categorical variables	Specifier
Gender	Male	0.890	0.045	−2.29	0.022	0.806	0.983
Admission priority
	Base: emergency
	Urgent	1.704	0.251	3.61	0.000	1.276	2.275
	Routine	1.100	0.306	0.34	0.733	0.637	1.899
ALC status	Yes	1.854	0.129	8.9	0.000	1.618	2.124
Any PSI	Yes	2.761	0.160	17.58	0.000	2.466	3.093
Trauma code called
	Base: no
	Yes	0.980	0.630	−0.03	0.975	0.278	3.457
	No data	1.459	0.939	0.59	0.557	0.414	5.148
Mechanism of injury
	Base: road traffic-related
	Penetrating/violent	0.778	0.054	−3.64	0.000	0.680	0.891
	Falls	0.896	0.051	−1.91	0.056	0.801	1.003
	Other	0.960	0.104	−0.37	0.71	0.776	1.188
Continuous variables
Admission age (years)		0.998	0.002	−1.19	0.233	0.995	1.001
Injury Severity Score		1.044	0.003	16.74	0.000	1.039	1.050
HOMR at admission		2.757	0.868	3.22	0.001	1.488	5.108
Charlson Comorbidity Index score (traditional)		1.071	0.034	2.16	0.03	1.007	1.140
Number of previous encounters (n)		1.045	0.070	0.66	0.51	0.916	1.193

Cost ratio: color range signifying cost ratios <1 (increasingly green)and red signifiying cost ratios >1 (increasingly red).
P value: red denotes P values < 0.05
ALC, alternate level of care; HOMR, hospital 1-year mortality risk score; PSI, patient safety indicator.