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Study
Competition and health plan performance: evidence from health maintenance organization insurance markets.
June 23, 2009
Scanlon D, Swaminathan S, Chernew M, et al. Med Care. 2005;43(4):338-346.
This study of 341 health maintenance organizations found that plans in markets with greater competition showed inferior performance on three of six standard quality measures. While the cross-sectional design does not permit causal inferences, these findings argue against the frequently encountered view that greater competition will foster improvements in safety and quality of care.
