Internetowy program radzenia sobie ze stresem dla nastolatków (FOREST-A)

The intervention group will get a 4-week online stress recovery intervention.

The internet-based psychosocial intervention will be delivered. The intervention comprises six modules: introduction, relaxation, psychological detachment, mastery, control, and summary, within psychoeducation and exercises in each module. The interactions with psychologists will be on demand. The whole intervention duration will be 4 weeks.

The control group will take care as usual.

The Recovery Experience Questionnaire (Sonnentag & Fritz, 2007) adapted Child and Adolescent version will be used to measure the changes in recovery from stress experience. It is a self-report measure comprising 16 items, with provided 5-point Likert scale, ranging from Totally disagree (=1) to Totally agree (=5). Total scores may range from 16 to 80, and higher scores will indicate higher recovery.

The Adjustment Disorder New Module-8 Child and Adolescent Version (Kazlauskas et al., 2018) will be used to measure the changes in symptoms of adjustment disorder, which are described in the International Classification of diseases 11th edition (WHO, 2018). The measure includes a list of 16 potentially stressful events (with binary answers Yes and No, indicating whether the participant has experienced a stressor) and 8 items for adjustment disorder symptoms evaluation (with a 4-point Likert scale ranging from Never (=1) to Often (=4)). Total scores may range from 8 to 32, and higher scores will indicate higher adjustment problems.

The Generalized Anxiety Disorder-7 scale (Spitzer, Kroenke, Williams, & Löwe, 2007) will be used to measure the changes in generalized anxiety symptoms.The measure comprises 7 items with the possible answers ranging on a 4-point Likert scale from Not at all (=0) to Nearly every day (=3). Total scores may range from 0 to 21. Higher scores will indicate higher generalized anxiety symptoms.

The Patient Health Questionnaire-9 (Löwe, Kroenke, Herzog, & Gräfe, 2004) will be used to measure changes in depressive symptoms. The measure comprises 9 items, with provided a 4-point Likert scale, ranging from Not at all (=0) to Nearly every day (=3). Total scores may range from 0 to 27. Higher scores will indicate higher depressive symptoms.

The WHO-5 Well-being Index (Topp, Østergaard, Søndergaard, & Bech, 2015) will be used to measure changes in general psychological well-being. The measure comprises 5 items with a Likert scale ranging At no time (=0) to All of the time (=5). Total scores may range from 0 to 25. Higher scores will indicate better psychological well-being.

The Perceived Positive Social Support Scale (Kazlauskas et al., 2022) will be used to measure changes in social support. The measure comprises 4 items, with provided an 8-point Likert scale ranging from Never (=0) to Always (=7). Total scores may range from 0 to 28. Higher scores will indicate higher perceived positive support.

Participants will be given questions regarding the usage, general satisfaction, usefulness of the program, and subjective impact on psychological and physical well-being.