Zucker K J, Green R, Coates S, Zuger B, Cohen-Kettenis P T, Zecca G M, Lertora V, Money J, Hahn-Burke S, Bradley S J, Blanchard R
Child and Adolescent Gender Identity Clinic, Child and Family Studies Centre, Clarke Institute of Psychiatry, Toronto, Ontario, Canada.
J Child Psychol Psychiatry. 1997 Jul;38(5):543-51. doi: 10.1111/j.1469-7610.1997.tb01541.x.
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.
对444名患有性别认同障碍（或有与此诊断相符行为）的男孩计算了同胞性别比（兄弟与姐妹的比例）。先证者是从几位患有这种疾病的专家以及1938年至1995年期间的英文病例报告文献中确定的。在至少有一个同胞的先证者中（N = 333），结果显示，与预期的106:100的二级性别比相比，患有性别认同障碍的男孩的兄弟与姐妹比例显著偏高，为131.1:100。兄弟比例过高重复了布兰查德、朱克、布拉德利和休姆（1995年）之前的一项研究结果，在该研究中同胞性别比为140.6:100。进一步分析表明，先证者相对于其兄弟出生的时间比相对于其姐妹出生的时间晚。这些发现可以用几种社会心理和生物学解释来解释，这需要进一步研究。
