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Article
November 1994

The Effect of Diagnostic Hierarchy in Genetic Epidemiological Studies of Psychiatric Disorders-Reply

Author Affiliations

College of Physicians and Surgeons Columbia University 722 W 168th St New York, NY 10032

Arch Gen Psychiatry. 1994;51(11):927. doi:10.1001/archpsyc.1994.03950110087012
Abstract

In reply  We welcome this opportunity to further clarify the concepts underlying the method that was used in our article1 to compute the risks for late-onset MD. There appears to be some confusion regarding our definition of late-onset MD. In this article1 as well as in our previous publications on this topic,2,3 we have defined late-onset MD as cases in which the first onset of MD occurs after age 30 years. In other words, the event of interest is that an individual remains free of MD until age 30, and then his or her first episode of MD develops after age 30. The rationale for this definition is that we are hypothesizing that individuals who have a first onset of MD after age 30 have a different form of the disorder from individuals who have a first onset of MD before age 30. Any recurrent episode of MD occurring before

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