Those arguing Medicaid expansion under Obamacare will result in healthier patients might want to see the results of a new study on the question.

The study, which analyzed data from thousands of low-income people in Oregon who received access to Medicaid, found that the coverage "generated no significant improvement in measured physical health outcomes."

Come January, millions of low-income adults will gain health insurance coverage through Medicaid in one of the farthest-reaching provisions of the Patient Protection and Affordable Care Act. For months, states have been fighting over whether to expand Medicaid, with many states still deciding. At least 18 states and the District of Columbia have decided they will move forward, providing coverage to all adults with incomes below 133 percent of the federal poverty line.

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