Roughly 2.8 million Americans aged 13 and older identify as transgender, accounting for approximately 1 percent of the U.S. population in that age group, according to a new estimate from the Williams Institute, a research organization focused on sexual orientation and gender identity issues.

About three-quarters of people who identify as transgender in the U.S. are younger than 35, according to the report published Wednesday, and 25 percent are between 13 and 17. Williams Institute researchers used data from the Behavioral Risk Factor Surveillance System (BRFSS) and Youth Risk Behavior Surveillance System (YRBSS) — public health surveys administered by the Centers for Disease Control and Prevention (CDC) — and statistical modeling to estimate the population of trans adults and youth in al

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