Birth order among homosexual men.
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.
Zucker
Kenneth J
KJ
Child and Adolescent Gender Identity Clinic, Child Psychiatry Program, ON, Canada. Ken_Zucker@camh.net
Blanchard
Ray
R
Siegelman
Marvin
M
D000328:Adult; D001722:Birth Order; D020010:Heterosexuality / Q000706:statistics & numerical data; D006716:Homosexuality / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D011606:Psychosexual Development