Table 2.

Summary of key measures used in the longitudinal, three-wave, questionnaire survey

	Measure used*	Comments
Symptoms of posttraumatic stress disorder (PTSD)	Harvard Trauma Questionnaire	The first 16 items on trauma symptoms in section IV will be used
Symptoms of anxiety and depression	Hopkins Symptom Checklist	The first 10 of the total 25 items will be used to measure symptoms of anxiety and the last 15 to measure symptoms of depression
Quality of life	WHO Quality of Life Assessment	The scale consists of 26 items and all will be included
Somatic pain	Questions adapted from the Tromsø Study	10 questions will be used, 5 concerning muscle/joint pain and 5 concerning more general somatic pain
Perceived general health	European Social Survey	Two items from the scale will be included
Sleep difficulties	The Bergen Insomnia Scale	The scale consists of six items and all will be included
Potentially traumatic eventsbefore the flight from Syria (pre-migratory PTEs)	The Refugee Trauma History Checklist (RTHC)	The scale consists of eight items and all will be included
Potentially traumatic events during the flight from Syria (peri-migratory PTEs)	RTHC	The scale consists of eight items and all will be included
Post-migration stressful experiences	Post-Migration Stress Scale	The scale consists of 24 items and all will be included
Social support	Enhancing Recovery in Coronary Heart Disease (ENRICHD) Social Support Inventory (ESSI)	The first six items of the scale will be included

*Further information on the measures used can be found in the ClinicalTrial.gov database where the study is registered (NCT03742128).