Prolonged Exposure for Swedish Immigrants

The PCL-5 is a 20-item self-report measure based upon the Diagnostic and Statistical Manual (DSM-5) criteria for PTSD. Total Score (Range 0-80 with higher scores representing more PTSD symptoms.

The CAPS-5 is structured interview that assesses the Diagnostic and Statistical Manual of Mental Disorders version 5 (DSM-5) criteria for PTSD (Weathers et al., 2013). Each item is rated on a severity scale ranging from 0 (Absent) to 4 (Extreme/incapacitating) and combines information about frequency and intensity for each of the 20 symptoms. Total Score (Range 0-80 with higher scores representing more PTSD symptoms.

The PHQ-9 is a widely used and well-validated instrument for measuring the severity of depressive symptoms. Scores are calculated based on how frequently a person experiences 9 symptoms of depression ranging from "not at all" response is scored as 0; "several days" response is 1; "more than half the days" response is 2; and "nearly every day" response is 3. Higher scores represents more depressive symptoms.

The SF-12 is a health-related quality-of-life questionnaire consisting of twelve questions that measure eight health domains to assess physical and mental health. Physical health-related domains include General Health (GH), Physical Functioning (PF), Role Physical (RP), and Body Pain (BP). Scores range from 0 to 100. A higher score means higher health.

Measures treatment expectancy and rationale credibility. The CEQ is a 5-item measure of the treatment's credibility and the patients' expectations. The patients assess each domain on a 11-point likert scale (scored 0-10), with a total score ranging between 0-50 where higher score indicates higher credibility and higher expectations.

The STIG-9 consists of nine items assessing cognitive, behavioural and affective aspects of perceived mental health-related stigma. The item responses are summarized in a sum score ranged 0-27 points. Higher scores indicate stronger expectations of negative societal beliefs, feelings, and behaviours towards 'mentally ill' people.

The Barriers to Access to Care Evaluation (BACE) is a 30-item measure scored from 0 (not at all) to 3 (a lot) with higher scores indicating a greater barrier.

MHKS is a twelve-item scale comprising domains of relevant evidence-based knowledge in relation to stigma toward mental illness. Items are coded on an ordinal scale (1-5). Items which the respondent strongly agrees with score 5 points; 1 point reflects a response to which the respondent strongly disagrees. The total score is calculated by adding the points obtained for each of the 12 items. Higher total scores correspond to greater knowledge

Self-rated questionnaire on healthcare utilization and productivity losses in patients with a psychiatric disorder. The TIC-P questionnaire measures costs in two dimensions: use of health resources and loss of productivity. Lower cost is better.

The CSQ-8 yields a single score measuring a single dimension of overall satisfaction. An "overall score" is calculated by summing the score on each of the eight scale item. Scores range from 8 to 32, with higher values indicating higher satisfaction.

The Internet Evaluation and Utility Questionnaire (IEUQ) is a 13-item measure that examines the participants' experiences of a web-based intervention. Score range from 0-72. Higher values indicating higher satisfaction.

Self-rated questionnaire on negative effects. It contains 20 items that are scored on a five point Likert-scale (0-4) and differentiates between negative effects that are attributed to treatment and those possibly caused by other circumstances. The total score of the NEQ ranges from 0 to 80 points, a higher score reflects more negative effects.

Data will be gathered on total number of completed modules during the 8 week treatment.

Data will be gathered on total number of messages sent and received back and forth between the participant and the therapist during the 8 week treatment.

During the nested study phase a subsample of the participants (N=5-15) will be interviewed at post-treatment regarded treatment comprehension, language adaptions and relevance.

The proportion of participants that conducts the weekly measures and further assessment points

Number of drop-outs from treatment