title: The combined effect of gender and age on post traumatic stress disorder: do men and women show differences in the lifespan distribution of the disorder?
abstract: BACKGROUND
  The aim of the study was to examine the combined effect of gender and age on post traumatic stress disorder (PTSD) in order to describe a possible gender difference in the lifespan distribution of PTSD.
  
  
  METHODS
  Data were collected from previous Danish and Nordic studies of PTSD or trauma. The final sample was composed of 6,548 participants, 2,768 (42.3%) men and 3,780 (57.7%) women. PTSD was measured based on the Harvard Trauma Questionnaire, part IV (HTQ-IV).
  
  
  RESULTS
  Men and women differed in lifespan distribution of PTSD. The highest prevalence of PTSD was seen in the early 40s for men and in the early 50s for women, while the lowest prevalence for both genders was in the early 70s. Women had an overall twofold higher PTSD prevalence than men. However, at some ages the female to male ratio was nearly 3:1. The highest female to male ratio was found for the 21 to 25 year-olds.
  
  
  CONCLUSIONS
  The lifespan gender differences indicate the importance of including reproductive factors and social responsibilities in the understanding of the development of PTSD.
authors.affiliation: National Centre for Psychotraumatology, University of Southern Denmark, Odense, Denmark. aelklit@health.sdu.dk.
authors.forename: Daniel N
authors.initials: DN
authors.lastname: Ditlevsen
authors.forename: Ask
authors.initials: A
authors.lastname: Elklit