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Post-only Evaluations of Several Drug Cost-Containment Policies on Medication Use and Health Outcomes
- Conclusions: Mixed effects on outcomes and costs
- Design: Post-policy comparisons of several groups (e.g., with and without employer insurance)
- No data on baseline comparability
- Statistical adjustment for group differences
- Problems:
- Study groups were already different with respect to SES and health status
- Instrumental variables, propensity scores, etc. can't fully control for bias
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