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Table 3 Trends in income inequalities in multimorbidity prevalence among adults in Ontario, 2005 to 2011/12

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

CCHS Cycle:

2005

2007/08

2009/10

2011/12

Trend

Relative Index of Inequality

RII (ridit score)

1.376* (1.233,1.535)

1.405* (1.280,1.543)

1.427* (1.290,1.579)

1.321* (1.191,1.466)

1.457* (1.288,1.649)

Age

 35–49

2.402* (2.093,2.756)

2.323* (2.007,2.689)

2.297* (2.011,2.624)

2.039* (1.742,2.387)

2.240* (2.081,2.412)

 50–64

5.531* (4.865,6.287)

5.031* (4.408,5.741)

4.649* (4.151,5.207)

4.116* (3.585,4.726)

4.737* (4.437,5.057)

 65–74

8.098* (7.164,9.155)

7.757* (6.825,8.816)

7.406* (6.620,8.287)

6.293* (5.553,7.131)

7.269* (6.843,7.721)

 75+

10.287* (9.152,11.564)

9.017* (7.936,10.245)

8.761* (7.859,9.767)

7.667* (6.742,8.719)

8.762* (8.251,9.304)

Sex

 Male

0.832* (0.791,0.876)

0.853* (0.808,0.901)

0.911* (0.862,0.963)

0.884* (0.836,0.935)

0.873* (0.849,0.898)

CCHS Cycle

    

1.067* (1.036,1.099)

RII*Cycle

    

0.981 (0.937,1.027)

Constant

0.065 (0.052,0.074)*

0.076 (0.067,0.087)*

0.079 (0.070,0.089)*

0.098 (0.085,0.113)

0.067 (0.061,0.074)*

Slope Index of Inequality

 SII (ridit score)

0.082* (0.054,0.109)

0.099* (0.072,0.127)

0.110* (0.079,0.141)

0.091* (0.057,0.124)

0.082* (0.047,0.116)

Age

 35–49

0.100* (0.085,0.115)

0.114* (0.095,0.132)

0.120* (0.101,0.139)

0.113* (0.089,0.137)

0.112* (0.102,0.122)

 50–64

0.316* (0.294,0.338)

0.338* (0.316,0.360)

0.330* (0.307,0.352)

0.332* (0.305,0.358)

0.329* (0.317,0.341)

 65–74

0.509* (0.483,0.535)

0.581* (0.554,0.608)

0.592* (0.566,0.618)

0.571* (0.546,0.596)

0.564* (0.551,0.577)

 75+

0.681* (0.657,0.706)

0.703* (0.677,0.729)

0.726* (0.703,0.749)

0.730* (0.703,0.756)

0.711* (0.699,0.723)

Sex

 Male

−0.048* (− 0.062,-0.035)

−0.048* (− 0.064,-0.032)

−0.030* (− 0.048,-0.013)

− 0.042* (− 0.060,-0.023)

−0.042* (− 0.050,-0.034)

CCHS Cycle

    

0.013* (0.005,0.021)

SII*Cycle

    

0.005 (−0.008,0.019)

Constant

0.053* (0.035,0.071)

0.056* (0.037,0.075)

0.048* (0.028,0.069)

0.079* (0.054,0.104)

0.026* (0.005,0.046)

Observations, N:

28,412

29,632

28,388

27,195

113,627

  1. *p < 0.05
  2. Data are regression coefficients from a Poisson regression (relative index of inequality, RII) or a linear probability model (slope index of inequality, SII)
  3. Estimates and corresponding standard errors were estimated with bootstrap sampling weights using balanced repeated replication
  4. For RII*Cycle, a statistically significant interaction with value > 1 (< 1) is indicative of increasing (decreasing) inequality on the relative scale over time; for the SII*Cycle, a positive (negative) and statistically significant interaction is indicative of increasing (decreasing) inequality on the absolute scale over time