PTH and post-traumatic stress disorder: This is in keeping with studies of military patients where the Migraine Disability Assessment Score has been found to be associated with the presence of PTSD, despite these military patients sustaining more severe head injuries than patients in our cohort (64% LOC vs 38% LOC in our cohort).3 Our study identifies a comorbidity prevalence rate of 40% for PTSD symptoms and PTH, which concurs with the results reported from another recent work.9