Patten, Scott B.2009-09-232009-09-232009-09-23http://hdl.handle.net/1880/47429This is a flash video presentation with animation depicting age-specific lifetime prevalence of Major Depressive Disorder. The goal of this project was to explore the puzzling pattern of lifetime prevalence by age - contrary to expectation the lifetime prevalence has been observed to decline with age. This has usually been interpreted as a cohort effect. The simulations (which derive from a steady state incidence-prevalence-mortality model) indicate that the puzzling pattern of declining lifetime prevalence with age does not necessarily represent a cohort effect - the simulations suggest that various factors may contribute: declining incidence with age, recall failure and differential mortality.engAttribution Non-Commercial No Derivatives 3.0 Unportedhttp://creativecommons.org/licenses/by-nc-nd/3.0/Health SciencesDepressive DisordersEpidemiologyPopulation StudiesMathematical ModelsPrevalence StudiesMajor Depressive DisorderMood Disordersvideo10.11575/PRISM/10756