Proefschrift

145 Use of fertility preservation among a cohort of transgirls in the Netherlands 8 RESULTS Study population characteristics are summarized in table 10. Table 10. Characteristics of the 35 transgirls at the start of treatment with gonadotropinreleasing hormone analogues Characteristics Mean ± SD, median (range), or number (%) Age (years) 14.8 ± 1.9 IQ total 100 ± 17 Testicular volume (mL) 15 ± 6 Tanner genital stage 5 (2-5) Ethnicity (n = 35) Caucasian 25 (71) Other 10 (29) Attracted to (n = 30) Men only 22 (63) Other 8 (23) Psychiatric comorbidity (n = 34) Yes 16 (46) No 18 (51) Interested in having children (n = 15) Yes 7 (20) No 4 (11) Maybe 4 (11) Missing data are not shown. SD refers to standard deviation. All adolescents had been informed on the risk of infertility, and 91% (n = 32) had been counselled about the option of FP. In the other three cases, it was not clear from the medical notes if they had been counselled; two of them were early pubertal (testicular volume 5 mL) so that no FP options were actually available. Forty-one percent (n = 13) of the counselled transgirls were referred for sperm cryopreservation, and 38% (n = 12) had actually been to the fertility clinic to try to cryopreserve sperm (figure 4). One transgirl who had been referred had not been to the fertility clinic and had not started treatment with GnRHa yet at the time of the analysis because of psychosocial issues.

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