Medicaid
The Oregon health insurance experiment (sometimes abbreviated OHIE) 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.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.