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Table 2 Decomposition of the Erreygers-corrected Concentration Index of multimorbidity prevalence among adults in Ontario: 2005 vs. 2011/12

From: Income inequalities in multimorbidity prevalence in Ontario, Canada: a decomposition analysis of linked survey and health administrative data

  CCHS 2005, N = 28,412 CCHS 2011–12, N = 27,195
Variable Marg. Effects Elas. Ck % Contr. Marg. Effects Elas. Ck % Contr.
Age Group (years) [REF = 18-34y]         
 35–49 0.15* 0.183 0.097 −12.7 0.161* 0.131 0.065 −12.2
 50–64 0.339* 0.286 0.095 −28.2 0.366* 0.289 0.120 −51.6
 65–74 0.489* 0.168 − 0.072 30.9 0.585* 0.177 − 0.044 29.9
v75+ 0.637* 0.162 − 0.086 48.2 0.773* 0.17 − 0.061 55.6
Sex [REF=Women]
 Men −0.066* −0.121 0.123 7.1 −0.056* −0.081 0.113 7.4
Marital Status [REF = Married]
 Other 0.039* 0.052 − 0.194 6.6 0.05* 0.057 − 0.258 15.2
Immigrant [REF=Born in Canada]
 Not born in Canada −0.003 −0.003 − 0.225 −0.6 − 0.03* −0.029 − 0.225 −7.8
Rurality [REF=Urban]
 Suburban −0.019* −0.015 0.042 0.7 −0.019 −0.011 0.066 1.5
 Rural −0.016 −0.005 0.018 0.3 −0.034* −0.008 0.028 1.1
Income (quintile) [REF = Q5 (high)]
 Q1 (Low) 0.06* 0.042 − 0.605 31.9 0.083* 0.044 − 0.589 57.2
 Q2 0.034* 0.025 − 0.341 10.1 0.047* 0.027 − 0.344 18.8
 Q3 0.011 0.008 −0.027 0.3 0.06* 0.034 − 0.050 3.5
 Q4 0.013 0.01 0.306 −3.4 0.03 0.019 0.299 −10.5
Education [REF=Some post-sec.]
 No Post-Secondary Education 0.001 0.001 −0.252 0.2 0.011 0.01 −0.242 3.2
Physical Activity [REF = Active]
Moderately Active 0.028* 0.026 0.064 −1.6 0 0 0.067 0
Inactive 0.027* 0.051 − 0.159 3.8 0.048* 0.066 − 0.193 10.8
Smoker [REF=Non-smoker]
 Heavy smoker 0.039* 0.009 − 0.016 0.5 0.05* 0.007 − 0.030 1.8
 Light smoker 0.021 0.013 −0.031 0.6 0.018 0.008 −0.068 1.4
 Former smoker 0.038* 0.035 0.045 −1.5 0.055* 0.037 0.061 −4
BMI [REF=Normal weight]
 Underweight −0.005 −0.001 − 0.021 −0.1 − 0.044 −0.003 − 0.024 −1.3
 Overweight 0.049* 0.063 0.043 −1.8 0.072* 0.073 0.041 −3.4
 Obese 0.154* 0.092 − 0.022 2.9 0.171* 0.095 − 0.002 0.4
LHIN [REF = Erie St. Clair]
 South West −0.035* −0.01 0.021 0.6 −0.061* −0.013 0.008 0.6
 Waterloo-Wellington −0.102* −0.021 0.022 2.0 −0.074* −0.013 0.014 1.2
 HNHB −0.018 −0.007 − 0.008 −0.1 − 0.077* −0.025 − 0.002 −0.2
 Central West −0.028 −0.006 − 0.033 −0.8 − 0.068* −0.012 − 0.031 −2.4
 Mississauga Halton −0.04 − 0.014 0.008 0.3 −0.01 − 0.003 0.003 0
 Toronto Central −0.013 −0.005 − 0.018 −0.2 − 0.097* −0.028 − 0.003 −0.3
 Central −0.042* −0.019 − 0.021 −0.8 − 0.089* −0.034 − 0.030 −3.1
 Central East −0.013 − 0.006 −0.018 − 0.2 −0.047 − 0.016 −0.027 −1.5
 South East −0.042* −0.006 0.006 0.2 −0.051 −0.006 0.007 0.4
 Champlain −0.037* −0.013 0.024 0.8 −0.042 −0.012 0.039 1.9
 North Simcoe Muskoka −0.051* −0.006 0.011 0.5 −0.056 −0.006 0.016 1.1
 North East −0.048* −0.008 − 0.008 −0.3 − 0.046 −0.006 0.008 0.4
 North West −0.075* −0.005 0.001 0.1 −0.12* −0.006 0.006 0.8
Primary Care Model [REF=None]
 Family Health Group 0.058* 0.052 0.029 −1.5 0.154* 0.128 − 0.042 7.5
 Family Health Network 0.015 0.003 0.019 −0.3 0.104* 0.008 0.011 −1.3
 Family Health Org. −0.052* −0.007 − 0.012 −0.6 0.105* 0.132 0.093 −11.5
 Other Model 0.058 0.001 0.000 0.0 0.121* 0.017 0.015 −2.1
Sum (of CErreygers)    −0.107 93.8    −0.093 108.6
Residual (unexplained)    −0.007     0.007  
Erreygers-corrected Concentration Index   −0.114     − 0.085  
  1. *indicates statistically significant (p < 0.05) marginal effect derived from multivariable probit regression model
  2. Elas. = Elasticity (βk * x̅k / μ); Ck = Erreygers-corrected Concentration Index of determinant k