Difference-in-Difference Estimates of the Association Between Medicaid Reimbursement Change and Duration and Influenza Vaccination Ratesa
| Coeff (95% CI) | |
|---|---|
| Differences by state group at baseline | |
| Smaller reimbursement change states | (ref) |
| Larger temporary reimbursement change states | −3.5 (−9.1, 2.1) |
| Larger extended reimbursement change states | −6.7 (−12.5, −0.8)* |
| Differences by time period | |
| Before (2011 to 2012) | (ref) |
| During (2013 to 2014) | −2.7 (−9.0, 3.6) |
| After (2015 to 2019) | −2.8 (−9.0, 3.4) |
| Difference-in-Difference estimates | |
| Temporary reimbursement change versus smaller change in 2013 to 2014 versus 2011 to 2012 | 3.0 (−3.8, 9.8) |
| Temporary reimbursement change versus smaller change in 2015 to 2019 versus 2011 to 2012 | 3.3 (−3.4, 10.0) |
| Larger extended reimbursement change versus smaller change in 2013 to 2014 versus 2011 to 2012 | 1.8 (−5.3, 8.9) |
| Larger extended reimbursement change versus smaller change in 2015 to 2019 versus 2011 to 2012 | 2.9 (−4.2, 10.0) |
Notes. aModels adjusted for age (continuous), sex, race/ethnicity, poverty status, mother’s age, mother’s marital status, type of vaccination facility, number of doctor visits in the past year, Medicaid managed care penetration rates (continuous), and state expansion status. Estimates were also weighted using sampling weights and include individual-level random effects. *P < .05.
Abbreviation: CI, confidence interval.