caa a22 4500 477117813 CHVBK 20180405111627.0 cr unu---uuuuu 170330e19961001xx s 000 0 eng 10.1007/BF02437544 doi (NATIONALLICENCE)springer-10.1007/BF02437544 Birth order and sibling sex ratio in two samples of Dutch gender-dysphoric homosexual males [Elektronische Daten] [Ray Blanchard, Kenneth Zucker, Petty Cohen-Kettenis, Louis Gooren, J. Bailey] Two studies were undertaken to confirm the previous findings that homosexual men in general tend to have a later than expected birth order and that extremely feminine homosexual men also tend to have a higher than expected proportion of brothers (i.e. a highersibling sex ratio). Subjects in Study 1 were Dutch, adult and adolescent, biological male patients with gender dysphoria (persistent and recurrent desires to belong to the opposite sex), who were undergoing treatment with feminizing hormones. These comprised 83 patients who reported sexual attraction to other males (the homosexual group) and 58 who reported sexual attraction to females or equal attraction to males and females (the nonhomosexual group). Subjects in Study 2 were Dutch adolescent male patients at another hospital. The homosexual group consisted of 21 gender-dysphoric homosexual teenagers referred to a gender identity clinic for children and adolescents. The control group were 21 adolescent males referred to the child psychiatry department of the same hospital for reasons other than gender identity disorder, homosexuality, or transvestism. These were individually matched to the homosexual subjects on age and sibship size. In both studies, the homosexual group had a significantly later average birth order than the comparison group. In Study 1, the homosexual group had a significantly elevated sibling sex ratio; this was not tested in Study 2 because of its small sample size. These studies add to the mounting evidence that late birth orders are common to all homosexual samples and that elevated sibling sex ratios are an additional characteristic of extremely feminine ones. Plenum Publishing Corporation, 1996 homosexuality nationallicence transsexualism nationallicence gender dysphoria nationallicence gender identity disorder nationallicence birth order nationallicence sibling sex ratio nationallicence Blanchard Ray Gender Identity Clinic, Clarke Institute of Psychiatry, 250 College, Street, M5T 1R8, Toronto, Ontario, Canada aut Zucker Kenneth Child and Adolescent Gender Identity Clinic, Child and Family Studies Centre, Clarke Institute of Psychiatry, Toronto, Ontario, Canada aut Cohen-Kettenis Petty Rudolf Magnus Institute for Neurosciences, Department of Child and Adolescent Psychiatry, University Hospital, Utrecht, The Netherlands aut Gooren Louis Department of Endocrinology, Free University Hospital, Amsterdam, The Netherlands aut Bailey J. Department of Psychology, Northwestern University, Evanston, Illinois aut Archives of Sexual Behavior Kluwer Academic Publishers-Plenum Publishers 25/5(1996-10-01), 495-514 0004-0002 25:5<495 1996 25 10508 https://doi.org/10.1007/BF02437544 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02437544 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Blanchard Ray Gender Identity Clinic, Clarke Institute of Psychiatry, 250 College, Street, M5T 1R8, Toronto, Ontario, Canada aut NATIONALLICENCE 700 1- Zucker Kenneth Child and Adolescent Gender Identity Clinic, Child and Family Studies Centre, Clarke Institute of Psychiatry, Toronto, Ontario, Canada aut NATIONALLICENCE 700 1- Cohen-Kettenis Petty Rudolf Magnus Institute for Neurosciences, Department of Child and Adolescent Psychiatry, University Hospital, Utrecht, The Netherlands aut NATIONALLICENCE 700 1- Gooren Louis Department of Endocrinology, Free University Hospital, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Bailey J. Department of Psychology, Northwestern University, Evanston, Illinois aut NATIONALLICENCE 773 0- Archives of Sexual Behavior Kluwer Academic Publishers-Plenum Publishers 25/5(1996-10-01), 495-514 0004-0002 25:5<495 1996 25 10508 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer