Psychological Medicine

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Two plus two equals three? Do we need to rethink lifetime prevalence?

A commentary on ‘How common are common mental disorders? Evidence that lifetime prevalence rates are doubled by prospective versus retrospective ascertainment’ by Moffitt et al. (2009)

E. Sussera1 c1 and P. E. Shrouta2

a1 Department of Epidemiology, Mailman School of Public Health, Columbia University, Department of Psychiatry, College of Physicians and Surgeons, and New York State Psychiatric Institute, USA

a2 Department of Psychology, New York University, USA

(Received September 09 2009)

(Accepted September 10 2009)

(Online publication October 29 2009)


c1 Address for correspondence: E. Susser, M.D., Dr.P.H., Mailman School of Public Health, Department of Epidemiology, Office 1030, 722 W. 168th St, New York, NY, 10032, USA. (Email: