Proportion of homosexual men who owe their sexual orientation to fraternal birth order: An estimate based on two national probability samples
Proportion of homosexual men who owe their sexual orientation to fraternal birth order: An estimate based on two national probability samples
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DOI：
10.1002/ajhb.20006
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发表时间：
2004-03-01
影响因子：
2.9
通讯作者：
Bogaert, AF
中科院分区：
文献类型：
--
作者：
Blanchard, R;Bogaert, AF
男性的同性恋倾向与一个人哥哥的数量有关，哥哥的数量越多，同性恋的可能性就越大。有理由相信，这种关系是因果关系，而不仅仅是统计，也就是说，哥哥产生的概率增加同性恋后出生的男性。根据这一假设，有可能估计出同性恋男子中能够将其性取向归因于其兄弟出生顺序（兄弟出生顺序）的比例。这个统计数据，人口归因分数（PAF），是根据在英国和美国的性行为调查研究中检查的2，256名异性恋男性和71名同性恋男性的合并档案数据计算的。PAF为28.6%，95%置信限为14.8%和48.0%。这些限制包括PAF的15.1%，以前估计与加拿大的样本。结果表明，同性恋男性的比例，其性取向归因于兄弟出生顺序构成少数，但不是一个微不足道的少数，所有同性恋男性。兄弟出生顺序的影响可能反映了一些母亲的渐进免疫Y-连锁抗原的每个成功的男性胎儿，并伴随着增加的影响，抗雄性抗体的性别分化的大脑在每个成功的男性胎儿。Am. J.哈姆。16：151-157，2004. (C)2004 Wiley-Liss，Inc.
Homosexuality in men correlates with an individual's number of older brothers, greater numbers of older brothers being associated with a greater probability of homosexuality. There are reasons to believe that this relationship is causal rather than merely statistical, that is, that older brothers produce the increase in the probability of homosexuality for later-born males. It is possible, under this assumption, to estimate the proportion of homosexual men who can attribute their sexual orientation to their birth order among their brothers (fraternal birth order). This statistic, the population attributable fraction (PAF), was computed on the combined archival data of 2,256 heterosexual and 71 homosexual men examined in survey studies of sexual behavior in the UK and the USA. The PAF was 28.6%, with 95% confidence limits of 14.8% and 48.0%. These limits encompass the PAF of 15.1% previously estimated with a Canadian sample. The results indicate that the proportion of homosexual men whose sexual orientation is attributable to fraternal birth order constitutes a minority, but not a negligible minority, of all homosexual men. The fraternal birth order effect may reflect the progressive immunization of some mothers to Y-linked antigens by each succeeding male fetus, and the concomitantly increasing effects of antimale antibodies on the sexual differentiation of the brain in each succeeding male fetus. Am. J. Hum. Biol. 16:151-157, 2004. (C) 2004 Wiley-Liss, Inc.