Far more U.S. teens than previously thought are transgender or identify themselves using other nontraditional gender terms, with many rejecting the idea that girl and boy are the only options, new research suggests. The study looked at students in ninth and 11th grade and estimated that nearly 3 percent are transgender or gender nonconforming, meaning they don't always self-identify as the sex they were assigned at birth. [Snip] The study is an analysis of a 2016 statewide survey of almost 81,000 Minnesota teens. Nearly 2,200 identified as transgender or gender nonconforming. The study found that these kids reported worse mental...