Expanding Medicaid can help lower Obamacare marketplace premiums by 7 percent, according to a federal report that is the latest to push back against headlines of high premiums for the health law.

The Obama administration report looked at 2015 data and found that Medicaid expansion affects the risk pool of enrollees in the Obamacare marketplace. That means that states that did expand Medicaid have more enrollees who are healthy and therefore pay lower premiums than states that didn’t expand.

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