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Background: When disasters occur, humanitarian relief workers frequently deploy to assist in rescue/recovery efforts.

Aims: To conduct a systematic review of factors affecting the psychological wellbeing of disaster relief workers and identify recommendations for interventions.

Method: We searched MEDLINE®, Embase, PsycINFO® and Web of Science for relevant studies, supplemented by hand searches. We performed thematic analysis on their results to identify factors predicting wellbeing.

Results: Sixty-one publications were included. Key themes were: pre-deployment factors (preparedness/training); peri-deployment factors (deployment length/timing; traumatic exposure; emotional involvement; leadership; inter-agency cooperation; support; role; demands and workload; safety/equipment; self-doubt/guilt; coping strategies) and post-deployment factors (support; media; personal and professional growth …