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Joseph T. Coyle, MD, Editor

Arch Gen Psychiatry. 2008;65(9):994.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

In March 2006, the Archives of General Psychiatry published an article by Bulik et al¹ on the heritability of anorexia nervosa based on the Swedish Twin Registry. Table 4 of the article (p 310) provided descriptive data for univariate analysis of anorexia nervosa. In this table, column headings were divided into "T1-No/T2-No"; "T1-Yes/T2-No"; and "T1-Yes/T2-Yes." The table note stated that T1 equaled twin 1, and T2 equaled twin 2. For the row designated "DZ-MF [dizygotic–male/female]" under the "Narrow DSM-IV AN [anorexia nervosa]" heading, 2212 twin pairs were "T1-No/T2-No," meaning that neither twin was affected; 0 were "T1-Yes/T2-Yes," meaning no dizygotic twinship discordant for sex had both affected; and 16 were "T1-Yes/T2-No." As there is a DZ-FM row above this one, the most logical interpretation is that T1 refers to the first twin by sex in a dizygotic twinship. This interpretation of Table 4 was used . . . [Full Text of this Article]

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