The Southwest has the lowest rate of health insurance coverage in the United States, with 30% of non-elderly adults and 18% of children uninsured, according a study by the Centers for Disease Control and Prevention. One expert theorized that the trend likely comes from a combination of factors, including state policy decisions and the fact that many jobs in the Southwest are service, construction or other jobs without good health benefits. New England has the largest proportion of its population covered, the study found.