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Key Points Question Can the effects of national insurance coverage decisions serve as an instrumental variable in comparative effectiveness research? Findings In this cross-sectional study of 76 077 patients who underwent… Click to show full abstract
Key Points Question Can the effects of national insurance coverage decisions serve as an instrumental variable in comparative effectiveness research? Findings In this cross-sectional study of 76 077 patients who underwent sleeve gastrectomy and gastric bypass, initiation of insurance coverage for sleeve gastrectomy in 2012 was associated with significant temporal and regional practice variation that was associated with treatment and balanced characteristics between treatment arms, making it a strong instrumental variable. Meaning These results suggest that initiation of insurance coverage for sleeve gastrectomy was associated with significant geographic and temporal variation, which served as a strong instrument to compare 2 bariatric surgical procedures.
Journal Title: JAMA Network Open
Year Published: 2022
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