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