Covariate-Adjusted Changes in the Relative Rate of Chronic Conditions pre- versus post-Medicare Age Eligibility by Longitudinal Insurance Patterns
| Adjusted Rate Ratio (95% CI) | |
|---|---|
| Time | |
| Pre-period | Reference |
| Post-period | 1.20 (1.20,1.21) |
| Longitudinal Insurance Pattern | |
| Continuously Insured | Reference |
| Continuously Uninsured | 0.76 (0.73,0.78) |
| Discontinuously Insured | 0.93 (0.90,0.96) |
| Gained Insurance | 0.88 (0.84,0.88) |
| Lost Insurance | 0.82 (0.79,0.87) |
| Time and Longitudinal Insurance Pattern Interaction terms | |
| Post-Period * Continuously Uninsured | 0.99 (0.98,1.01) |
| Post-Period * Discontinuously Insured | 1.02 (1.00,1.03) |
| Post-Period * Gained Insurance | 1.06 (1.05,1.07) |
| Post-Period * Lost Insurance | 0.93 (0.91,0.94) |
Abbreviation: CI, confidence interval.
Notes: Bolded estimates were significant at P < .05. Adjusted rates were computed using Poisson GEE models with an exchangeable correlation structure clustered on primary clinic. Estimates adjusted for sex, race and ethnicity, federal poverty level, and geographic location.