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2003Zucker Kenneth J; Blanchard Ray; Siegelman Marvin
Birth order among homosexual men.
Psychological reports 2003;92(1):117-8.
Nicolosi and Byrd in 2002 summarized empirical research on birth order and sexual orientation in men, which research has documented that homosexual men have a later birth order than heterosexual men. They did not, however, note a more refined analysis of an earlier null finding by Siegelman. This 1998 reanalysis by Blanchard, Zucker, Siegelman, Dickey, and Klassen also confirmed the later birth order of homosexual men.

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