Warren County is home to the highest percentage of people without health insurance in Tennessee, according to a recent release of federal statistics.That news came from the top executive of Saint Thomas Health, the not-for-profit healthcare giant that has taken full ownership of McMinnville’s River Park Hospital. Karen Springer, Saint Thomas president and CEO, pointed to Warren County’s chart-topping uninsured rate during a recent forum on healthcare policy in Murfreesboro. Public radio WCPI 91.3 recorded the event for local broadcast this week.Springer was referring to a report from the U.S. Department of Health and Human Services showing 20 percent of Warren County adults under the age of 65 have no health insurance.