caa a22 4500 606232311 CHVBK 20210128101225.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s10508-014-0425-9 doi (NATIONALLICENCE)springer-10.1007/s10508-014-0425-9 Birth Order and Sibling Sex Ratio in a Population with High Fertility: Are Turkish Male to Female Transsexuals Different? [Elektronische Daten] [Ali Bozkurt, Ozlem Bozkurt, Ipek Sonmez] Western studies have consistently found that androphilic (sexually attracted to men) male-to-female transsexuals have a later birth order and a relative excess of brothers compared with appropriate control participants. However, non-Western studies on birth order and sibling sex ratio in androphilic males (transsexual or non-transsexual) are rare. The objective of the study was to test the hypothesis that androphilic male-to-female transsexuals have a late birth order and a relative excess of brothers in a non-Western culture with a higher fertility rate. The participants were 60 androphilic male-to-female transsexuals and 61 male heterosexual controls. The transsexual participants had significantly more older brothers than the control participants, but the groups did not differ in their numbers of older sisters, younger brothers, or younger sisters. The foregoing pattern is usually referred to as the "fraternal birth order effect.” Slater's and Berglin's Indexes both showed that the mean birth order of the control participants was very close to that expected from a random sample drawn from a demographically stable population whereas the mean birth order of the transsexual participants was later. A measure of sibship composition, brothers/all siblings, showed that the transsexual group had a higher proportion of male siblings compared with the control group. In conclusion, the present study found that Turkish androphilic male-to-female transsexuals show the same high fraternal birth order that has been found in comparable androphilic samples in Western Europe, North America, and the South Pacific, which suggests a common underlying biological causal mechanism. Springer Science+Business Media New York, 2014 Birth order nationallicence Sibling sex ratio nationallicence Gender identity disorder nationallicence Transsexualism nationallicence Androphilia nationallicence Cross-cultural nationallicence Bozkurt Ali Department of Psychiatry, School of Medicine, Near East University, Near East Boulevard, Nicosia-TRNC, Mersin 10, Turkey aut Bozkurt Ozlem Department of Child and Adolescent Psychiatry, Ankara Pediatric and Pediatric Hematology Oncology Training and Research Hospital, Ankara, Turkey aut Sonmez Ipek Department of Psychiatry, School of Medicine, Near East University, Near East Boulevard, Nicosia-TRNC, Mersin 10, Turkey aut Archives of Sexual Behavior Springer US; http://www.springer-ny.com 44/5(2015-07-01), 1331-1337 0004-0002 44:5<1331 2015 44 10508 https://doi.org/10.1007/s10508-014-0425-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10508-014-0425-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bozkurt Ali Department of Psychiatry, School of Medicine, Near East University, Near East Boulevard, Nicosia-TRNC, Mersin 10, Turkey aut NATIONALLICENCE 700 1- Bozkurt Ozlem Department of Child and Adolescent Psychiatry, Ankara Pediatric and Pediatric Hematology Oncology Training and Research Hospital, Ankara, Turkey aut NATIONALLICENCE 700 1- Sonmez Ipek Department of Psychiatry, School of Medicine, Near East University, Near East Boulevard, Nicosia-TRNC, Mersin 10, Turkey aut NATIONALLICENCE 773 0- Archives of Sexual Behavior Springer US; http://www.springer-ny.com 44/5(2015-07-01), 1331-1337 0004-0002 44:5<1331 2015 44 10508