Internet-delivered Trauma-focused Cognitive-behavioral Therapy as an Early Intervention After Sexual Trauma

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 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 CAPS-5 is a 20-item clinical administered interview 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 ITQ includes six items measuring each PTSD symptom cluster and these items measure how bothersome each symptom has been in the past month. The ITQ also includes six items measuring each 'Disturbance in Self- Organization' (DSO) symptom in complex PTSD. These items measure how a respondent typically feels, thinks about oneself, and relates to others. The PTSD and DSO symptoms are accompanied by three items measuring associated functional impairments in the domains of social, occupation, and other important areas of life. All items are answered on a 5-point Likert scale ranging from 0 (Not at all) to 4 (Extremely). Thus, PTSD and DSO symptom scores range from 0 to 24 and CPTSD symptom scores range from 0 to 48. Higher scores represents more PTSD and complex PTSD symptoms.

WSAS is a short, self-reported instrument consisting of five items about psychosocial impairments rated on a nine-point Likert scale. A higher score means more severe impairment.

Change in overall health from baseline to post treatment and follow up . EQ-5D is a standardized self-report measure of overall health status measured in terms of five dimensions; mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. Mobility dimension asks about the person's walking ability. Self-care dimension asks about the ability to wash or dress by oneself, and usual activities dimension measures performance in "work, study, housework, family or leisure activities". In pain/discomfort dimension, it asks how much pain or discomfort they have, and in anxiety/depression dimension, it asks how anxious or depressed they are. The respondents self-rate their level of severity for each dimension using a three-level scale: 1 having no problems, 2 having some problems and 3 having extreme problems. A higher score indicate worse severity.

point Likert scale (0-4) and differentiates between hazardous alcohol use, dependence symptoms, and harmful alcohol use. The total score of the AUDIT ranges from 0 to 40 points, with a higher score reflecting greater risk of alcohol use disorders.

Self-rated questionnaire on drug use. It contains 11 items that are scored on a five-point Likert scale (0-4) and differentiates between hazardous drug use, dependence symptoms, and harmful drug use. The total score of the DUDIT ranges from 0 to 44 points, with a higher score reflecting greater risk of drug use disorders.

Adverse events related to treatment measured by with a free text option where participant is instructed to describe the possible event in detail. If the participant reported any adverse event, additional follow-up questions about intensity, duration etc. will also be given.

Self-rated questionnaire on negative effects. It contains 32 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.

Qualitative questions pertaining participants satisfaction with the treatment.

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.

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

Data will be gathered on total number of completed home work assignments by the participant during the three week treatment.

Data will be gathered on total number of messages sent and received in the digital platform during the three week treatment.

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

The proportion of participants that go through the entire treatment period

Number of drop-outs from treatment

Data on rates of inclusion will be considered as an indication of the feasibility of the intervention.

Self-rated questionnaire on perceived social support. It contains 12 items that are scored on a seven-point Likert scale (1-7) and differentiates between perceived support from family, friends, and a significant other. The total score of the MSPSS ranges from 12 to 84 points, with a higher score reflecting greater perceived social support.