“…Somewhere between 2% and 3% of school-aged children both "behave like the opposite sex" and "wish to be the opposite sex" with regular frequency (Van Beijsterveldt, Hudziak, & Boomsma, 2006;see Zucker & Lawrence, 2009, for a review), suggesting that an unexpected "mismatch" between sex and gender likely occurs within nearly one in every two classrooms. And a recent representative study of New Zealander high school students showed that 1.2% of them identified as transgender, with 94.7% identifying as nontransgender (the remainder was unsure or did not understand the question; Clark et al, 2014). Depending on the specific definition one uses of intersex, these children are also more common than many believe as they represent 0.02% to 1.7% of children (Ainsworth, 2015;Fausto-Sterling, 1993;Sax, 2002).…”