A major part of the study took place at the Providence Portland Medical Center.
The Oregon health insurance experiment (sometimes abbreviated OHIE)[1] was a research study looking at the effects of the 2008 Medicaid expansion in the U.S. state of Oregon, which occurred based on lottery drawings from a waiting list and thus offered an opportunity to conduct a randomized experiment by comparing a control group of lottery losers to a treatment group of winners, who were eligible to apply for enrollment in the Medicaid expansion program after previously being uninsured.[2]
The study's results have been published in the academic journals The Quarterly Journal of Economics, Science, The New England Journal of Medicine, and The American Economic Review. In the first year after the lottery, Medicaid coverage was associated with higher rates of health care use, a lower probability of having medical debts sent to a collection agency, and higher self-reported mental and physical health.[2] In the 18 months following the lottery, researchers found that Medicaid increased emergency department visits.[3]
Approximately two years after the lottery, researchers found that Medicaid had no statistically significant impact on physical health measures, but "it did increase use of health care services, raise rates of diabetes detection and management, lower rates of depression, and reduce financial strain."[4][5]
Commentators in publications such as Forbes and RealClearPolitics cited the study as evidence that the Medicaid program fails its central cause of assisting the American poor,[4][5] but other commentators in publications such as The New Republic and the Daily Kos stated that the evidence of improved financial security and mental health provided a significant social benefit.[6][7]
^Grant, Roy (February 2014). "The Triumph of Politics Over Public Health: States Opting Out of Medicaid Expansion". American Journal of Public Health. 104 (2): 203–205. doi:10.2105/AJPH.2013.301717. PMC 3935692. PMID 24328625.
^ abFinkelstein, Amy; Taubman, Sarah; Wright, Bill; Bernstein, Mira; Gruber, Jonathan; Newhouse, Joseph P.; Allen, Heidi; Baicker, Katherine; Oregon Health Study Group (August 2012). "The Oregon Health Insurance Experiment: Evidence from the First Year". The Quarterly Journal of Economics. 127 (3): 1057–1106. doi:10.1093/qje/qjs020. PMC 3535298. PMID 23293397.
^Taubman, Sarah; Allen, Heidi; Wright, Bill; Baicker, Katherine; Finkelstein, Amy; Oregon Health Study Group (January 17, 2014). "Medicaid Increases Emergency Department Use: Evidence from Oregon's Health Insurance Experiment". Science. 343 (6168): 263–268. Bibcode:2014Sci...343..263T. doi:10.1126/science.1246183. PMC 3955206. PMID 24385603.
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