This column appears in the Nevada Appeal Wednesday health pages. It addresses topics related to the health of our community. Teen birth rates in the United States have declined to the lowest levels since the 1940s, but they are still nine times higher than in most other developed countries. Nevada has one of the highest rates of teen pregnancy in the nation, and in Nevada, Carson City has the highest rate of all, according to county health rankings released last year by the Robert Wood Johnson Foundation. The state capital has a rate of 60 births per 1,000 girls ages …