Objective | Measure | Measurement timepoint | Participant group |
---|---|---|---|
Demographic information | Self-rated custom questions | T1 | All |
Primary outcome | Insomnia severity (Insomnia severity index) | Screening, T1, T2, T3, T4 | |
Secondary outcomes | Health-related quality of life (EuroQol EQ5D-5L) | T1, T2, T3, T4 | |
Fatigue (Chalder Fatigue Scale) | T1, T2, T3, T4 | ||
Mental distress (Hopkins Symptoms Checklist) | T1, T2, T3, T4 | ||
Moderator | Chronotype (Brief Horne-Östberg Morningness-Eveningness Questionnaire) | T1, T2, T3, T4 | |
Mediators | Unhelpful beliefs about sleep (Dysfunctional Beliefs and Attitudes about Sleep questionnaire-16) | T1, T2, T3, T4 | |
Sleep reactivity (Ford Insomnia Response to Stress Test) | T1, T2, T3, T4 | ||
Subjective assessment of sleep patterns | 7-day sleep diary | T1, T2, T3, T4 | |
Mixed-method process evaluation of facilitators and barriers of participants’ treatment adherence in group-delivered CBT-I | Motivation for treatment (Nijmegen Motivation List 2) | T1 | ~ 60 intervention group participants |
Treatment credibility (Credibility / Expectancy Questionnaire) | T1 | ||
Adherence to CBT-I components (Treatment Components Adherence Scale) | T3 | ||
Evaluation of treatment (CBT-I evaluation scale) | T3 | ||
Individual semi-structured interviews | T2, T3 | 10–12 intervention group participants | |
Evaluation of sick leave rates, medication use, and healthcare services utilization | Norwegian Patient Registry | T5, T6 | All intervention group participants |
Norwegian Prescription Database | T5, T6 | ||
National Insurance Administration | T5, T6 |