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Table 3 Result of Poisson regression analysis, testing horizontal equity across levels of socio-economic position (SEP) with differential needs

From: Is the high-risk strategy to prevent cardiovascular disease equitable? A pharmacoepidemiological cohort study

SEP indicator a  Age 40-64 Age 65-84
  Male Female Male Female
Income Quintiles IRRb 95% CI c  IRR 95% CI IRR 95% CI IRR 95% CI
1 1.00   1.00   1.00   1.00  
2 1.22 (1.10-1.35) 1.27 (1.04-1.55) 1.27 (1.05-1.54) 1.25 (1.04-1.51)
3 1.38 (1.29-1.48) 1.63 (1.39-1.92) 1.38 (1.17-1.63) 1.16 (0.93-1.45)
4 1.61 (1.47-1.76) 1.73 (1.40-2.15) 1.58 (1.36-1.84) 1.54 (1.27-1.86)
5 1.89 (1.70-2.10) 2.44 (1.86-3.21) 1.99 (1.68-2.35) 2.26 (1.80-2.80)
HIE gradient d 1.17 (1.14-1.19) 1.23 (1.16-1.29) 1.17 (1.14-1.20) 1.20 (1.14-1.27)
Educational level IRR 95% CI IRR 95% CI IRR 95% CI IRR 95% CI
1 1.00   1.00   1.00   1.00  
2 1.29 (1.17-1.42) 1.38 (1.27-1.49) 1.19 (1.07-1.33) 1.33 (1.13-1.56)
3 1.40 (1.18-1.66) 1.49 (1.33-1.65) 1.34 (1.19-1.52) 1.52 (1.23-1.89)
4 1.74 (1.51-2.01) 1.90 (1.72-2.09) 1.77 (1.59-1.97) 1.70 (1.47-1.97)
HIE gradient 1.19 (1.15-1.24) 1.24 (1.19-1.29) 1.21 (1.17-1.25) 1.21 (1.14-1.28)
  1. a) Indicators of SEP: Quintiles of disposable income and 4 levels of formal education, cf. notes Table 1.
  2. b) Poisson regression analyses of need-standardized statin Incidence Rate Ratio (IRR), applying need-standardized statin incidence parameters within gender and 5-year age-groups, based on indirect standardization with Incidence of myocardial infarction in the background population as need-weights, cf. Table 2.
  3. c) Bootstrapping (10,000 reps.) is applied for 95% confidence intervals (CI).
  4. d) Horizontal Inequity (HIE) gradient: The relative change in need-standardized statin incidence for each increase in SEP, i.e., the estimated overall linear trend.