The state is doing well by some measures, but the March of Dimes says one risk factor -- the number of uninsured women -- is moving in the wrong direction.

When it comes to rates of pre-term births, Maine gets a "C." That's according to the March of Dimes, which today released its "2009 Premature Birth Report Card."

The organization says Maine is doing well in reducing the known risks for premature births, such as smoking. The number of late pre-term births has also dropped. But another risk factor, the number of uninsured women, has risen in Maine, the group says.

The study found that in 2007 -- the most recent figures cited -- 10.2 percent of births in Maine occurred pre-term. That's an improvement over 2006's rate of 11.1 percent, and lower than the national average of 12.7 percent.

Vermont and New Hampshire have the nation's lowest pre-term birth rates, the group says. Vermont was the only state in the nation to get a grade of "B" on the survey, with a 2007 rate of 9.2 percent, while New Hampshire was graded "C" with a rate of 9.4 percent.

To compare states' pre-term birth rates, click here.