Ecological analyses of the associations between injury risk and socioeconomic status, geography and Aboriginal ethnicity in British Columbia, Canada

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Table 3 Ecologic analysis of risk of hospitalization due to injury among Health Service Delivery Area population groups in British Columbia, 1999–2008*

X variable	Min	Max	Mean^‡	SD^‡	N	B^§	L95CL	U95CL	SE^\\	p**	SRR change per SD^††	L95CL^‡‡	U95CL^‡‡
Regression ^† statistics from best-fitting model with multiple independent (X) variables
(Constant)					92	0.321	0.029	0.614	0.147	0.032	0.000	0.000	0.000
House needs major repairs	0.050	0.478	0.186	0.116	92	1.769	0.661	2.877	0.557	0.002	0.205	0.077	0.334
Rural	0.000	0.446	0.228	0.153	92	0.954	0.652	1.256	0.152	0.000	0.146	0.100	0.192
Occupation risk	0.805	1.446	1.111	0.146	92	0.357	0.067	0.647	0.146	0.016	0.052	0.010	0.095
Aboriginal	0.007	1.010	0.676	0.447	92	1.169	0.911	1.426	0.129	0.000	0.523	0.408	0.638

Multivariable model statistics: R squared = 0.905, F = 208.254, p = 0.000
* Three population groups (total, Aboriginal on-reserve and Aboriginal off-reserve) divided by 16 HSDAs and 2 time periods (1998–2003 and 2004–2008)
^†The dependent (Y) variable is standardized relative risk (SRR) of hospitalization due to injury, and regression is weighted by person-years
^‡Unweighted mean and standard deviation (SD) of the independent (X) variable
^§B = regression coefficient
^¶95 % confidence limit for the Relative Risk Ratio per SD
^\\SE = standard error of the regression coefficient
** p = probability that B = 0
^††Relative Risk Ratio per SD = exp(BxSD). One SD change in the independent variable is associated with this absolute change in the SRR of injury
^‡‡95 % confidence limit for the Relative Risk Ratio per SD