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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.