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Table 3 Comparison of zoster vaccination rate between Medicare Part D members and commercial plan members aged ≥65a

From: Impact of the change of copay policy in Medicare Part D on zoster vaccine uptake among Medicare beneficiaries in a managed care organization

Characteristics

Medicare Part D (65+)

Commercial (65+)

Difference-in-difference

  

Rate ratio (2012/2011)

Rate ratio (2012/2011)

Ratio of rate ratio

p-valueb

Difference of rate ratio

Overall

1.57

1.52

1.03 (0.99;1.07)

0.178

0.04 (−0.02;0.10)

Age

 60–64

N/A

N/A

   

 65–69

1.55

1.48

1.04 (0.99;1.11)

0.141

0.07 (−0.02;0.15)

 70–74

1.53

1.54

0.99 (0.92;1.08)

0.853

−0.01 (−0.14;0.12)

 75+

1.57

1.55

1.01 (0.94;1.09)

0.732

0.02 (−0.10;0.14)

Sex

 Female

1.52

1.48

1.02 (0.97;1.08)

0.411

0.03 (−0.05;0.11)

 Male

1.64

1.57

1.04 (0.98;1.11)

0.187

0.07 (−0.03;0.16)

Race/Ethnicity

 Non-Hispanic white

1.63

1.53

1.06 (1.01;1.12)

0.020

0.09 (0.01;0.18)

 Non-Hispanic black

1.62

1.53

1.06 (0.90;1.24)

0.467

0.09 (−0.18;0.36)

 Hispanic

1.48

1.51

0.98 (0.89;1.08)

0.721

−0.03 (−0.18;0.13)

 Asian/Pacific Islanders

1.37

1.54

0.89 (0.79;1.00)

0.050

−0.17 (−0.36;0.01)

 Others/unknown

1.96

1.55

1.26 (1.00;1.61)

0.054

0.41 (−0.05;0.87)

  1. a Per 100,000 person-days and from 2011 to 2012
  2. b Calculated using linear spline Poisson regression model