Transgender
One effort to quantify the population gave a "rough estimate" that 0.3 percent of adults in the US are transgender, overlapping to an unknown degree with the estimated 3.5 percent of US adults (1-in-30) who identify as LGBT. More recent studies released in 2016 estimate the proportion of Americans who identify as transgender at 0.5 to 0.6%. This would put the total number of transgender Americans at approximately 1.4 million adults ().
History of transgender people in the United States
In 2015, the American Psychological Association's Council of Representatives adopted "Guidelines for Psychological Practice with Transgender and Gender Nonconforming People" at the Association's 123rd Annual Convention. Such guidelines set ideals to which the American Psychological Association encourages psychologists to aspire. According to the "Guidelines for Psychological Practice with Transgender and Gender Nonconforming People", psychologists who work with transgender or gender nonconforming people should seek to provide acceptance, support and understanding without making assumptions about their clients’ gender identities or gender expressions.