Background measures
Anxiety, anxiety, traumatic, PTSD, depression, Depression, Post-Traumatic Stress Disorder
Age, sex, and years since last completed dental treatment were registered at enrolment along with symptoms of anxiety, depression and Post-Traumatic Stress Disorder (PTSD). Self-report scales were employed. All the scales are extensively used worldwide and have been shown to be valid and reliable (see details in the description of each scale).Participants that reported a traumatic incidence were asked to complete the PTSD checklist for DSM-IV (PCL), version PCL-S. The scale assesses PTSD-symptoms through 17 questions with five possible answers, resulting in a sum score of 17 to 85. Cut-off in a non-clinical population is proposed to be 35 [Symptoms of anxiety and depression were assessed with the Hospital Anxiety and Depression Scale (HADS) developed by Zigmond et al. in 1983 [