Among those on Medicaid, by age 17, about 0.14 percent of natal girls were taking testosterone and about 0.06 percent of natal boys were taking estrogen during the 2019 to 2023 study period. By comparison, in the study about privately insured youth, which covered 2018 to 2022, the respective percentages of natal girls and natal boys taking cross-sex hormones by age 17 were about 0.14 percent and 0.08 percent.