Background
The number of refugees is at its highest since the Second World War and on the rise. Many refugees suffer from anxiety, depression and post-traumatic stress disorder (PTSD), but exact and up-to-date prevalence estimates are not available.

Aims
To report the pooled prevalence of anxiety and mood disorders and PTSD in general refugee populations residing in high-income countries and to detect sources of heterogeneity therein.

Method
Systematic review with meta-analyses and meta-regression.

The death of a loved one may precipitate symptoms of prolonged grief disorder (PGD), post‐traumatic stress disorder (PTSD) and depression. Brooding about the causes and consequences of one's negative affect (NA), also termed depressive rumination, has been linked to distress after loss. The role of dysregulation of positive affect (PA) has received less attention. We examined (1) the factor structure of depressive rumination and PA dysregulation and (2) to what extent these factors were related to PGD, PTSD and depression symptom levels.

Background: Sleep disturbance has been described as a ‘hallmark’ symptom of posttraumatic stress disorder (PTSD). Although there are robust findings of self-reported sleep disturbance in PTSD, evidence of sleep disturbance measured using actigraphy is less certain.

Objective: To conduct a systematic review and meta-analysis to determine whether there are any significant differences between individuals with and without PTSD in actigraphderived sleep measures.

Background: The diagnostic criteria for posttraumatic stress disorder (PTSD) differ between DSM-5 and ICD-11, which may affect the estimation of prevalence.

Objective: To investigate the concordance of ICD-11 and DSM-5, as compared to ICD-10 and DSM-IV, regarding PTSD caseness among Japanese people who had experienced different potentially traumatic events. In addition, we estimated the comorbidity with major depressive disorder and generalized anxiety disorder according to these four diagnostic manuals.