Sibling Sex Ratio of Boys with Gender Identity Disorder

Sibling sex ratio (the ratio of brothers to sisters) was calculated for 444 boys with gender identity disorder (or with behaviors consistent with this diagnosis). The probands were ascertained from several researchers with expertise with this disorder and from the English language case report litera...

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Bibliographic Details
Published in:Journal of child psychology and psychiatry 1997-07, Vol.38 (5), p.543-551
Main Authors: Zucker, Kenneth J., Green, Richard, Coates, Susan, Zuger, Bernard, Cohen-Kettenis, Peggy T., Zecca, Graziella Mansueto, Lertora, Vincenza, Money, John, Hahn-Burke, Sarah, Bradley, Susan J., Blanchard, Ray
Format: Article
Language:English
Subjects:
Biological and medical sciences
birth order
Boys
Child
Child clinical studies
Child psychology
Child, Preschool
Family Characteristics
Gender Identity
Gender identity disorder
Humans
Male
Medical sciences
Mental disorders
Miscellaneous
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
Psychosexual Development
Sex Ratio
Sex ratios
Sexes
Sexual Dysfunctions, Psychological - genetics
Sexuality
Sibling Relations
sibling sex ratio
Siblings
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Summary:Sibling sex ratio (the ratio of brothers to sisters) was calculated for 444 boys with gender identity disorder (or with behaviors consistent with this diagnosis). The probands were ascertained from several researchers with expertise with this disorder and from the English language case report literature between 1938 and 1995. Among the probands with at least one sibling (N= 333), the results showed that boys with gender identity disorder had a significant excess of brothers to sisters, 131.1:100, when compared with the expected secondary sex ratio of 106:100. The excess of brothers replicated a previous study by Blanchard, Zucker, Bradley, and Hume (1995), in which the sibling sex ratio was 140.6:100. Further analyses showed that the probands were born later relative to their brothers than they were relative to their sisters. These findings are amenable to several psychosocial and biological explanations, which require further investigation.
ISSN:0021-9630
1469-7610
DOI:10.1111/j.1469-7610.1997.tb01541.x