Examining equity in the utilisation of psychiatric inpatient care among patients with severe mental illness (SMI) in Ontario, Canada

Table 2 Summary of key values of the binomial regressions for the main analysis and sensitivity analyses

Model specification	Variable	Core model			Core + need model			Full model
		IRR	SE	P-value	IRR	SE	P-value	IRR	SE	P-value
Main analysis	Material deprivation score	1.435	1.013	<0.0001	1.074	1.011	<0.0001	1.081	1.011	<0.0001
	Interaction term	0.987	1.014	0.367	0.994	1.012	0.649	0.993	1.012	0.559
Sensitivity analysis (including depression)	Material deprivation score	1.435	1.013	<0.0001	1.066	1.012	<0.0001	1.078	1.012	<0.0001
	Interaction term	0.987	1.014	0.367	0.992	1.013	0.502	0.989	1.012	0.380
Sensitivity analysis (excluding patients 75 and older)	Material deprivation score	1.435	1.013	<0.0001	1.074	1.011	<0.0001	1.081	1.011	<0.0001
	Interaction term	0.987	1.014	0.367	0.994	1.012	0.649	0.993	1.012	0.559
Sensitivity analysis (minimum 1 admission per dissemination area)	Material deprivation score	1.196	1.012	<0.0001	1.012	1.011	0.257	1.018	1.010	0.085
	Interaction term	1.000	1.012	0.974	1.012	1.010	0.222	1.010	1.010	0.277

Legend: IRR Incidence Rate Ratio, SE Standard error
Notes: “interaction term” denotes an interaction between the material deprivation score and a dummy variable for the year 2010; standard errors are clustered at the dissemination area level

ISSN: 1471-244X