Wash. ranked 15th healthiest state in U.S.

Vermont tops the nation as the healthiest state, according to United Health Foundation's 2011 America's Health Rankings, thanks in part to a high rate of high school graduation and low incidence of infectious disease.

New Hampshire, Connecticut, Hawaii and Massachusetts rounded out the rest of the top five healthiest states.

Washington was ranked 15th, with its strengths listed as a low prevalence of smoking, a low rate of preventable hospitalizations and a lower prevalence of diabetes than other states.  However, its challenges were listed as low immunization coverage, low use of early prenatal care and a low high school graduation rate.

In the past decade, obesity increased in Washington from 18.8 percent to 26.2 percent of adults, with more than 1.3 million obese adults in the state.  High school graduation is the lowest in seven years, at 71.9 percent of incoming ninth graders who graduate in four years.

To see the rankings in full, click here.