The authors reply: PTSD due to childbirth stands at between 3.1% (adjusted) and 5.8% (unadjusted)

Alcorn et al. (2010) was a prospective longitudinal study of the prevalence of post-traumatic Stress Disorder (PTSD) resulting from childbirth events. One of the features of this work was not only to estimate the absolute prevalence of PTSD, but to adjust these estimates for pre-existing PTSD symptomatology and other more common postnatal symptomatology, such as depression and anxiety. It is of course possible if not probable, that these affective expressions are comorbid or predominantly represent the same underlying post-traumatic sequelae.