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Table 1 Overview of instruments per time of measurement (T0, T1, T2)

From: Log in and breathe out: efficacy and cost-effectiveness of an online sleep training for teachers affected by work-related strain - study protocol for a randomized controlled trial

  Number of items Screening T0 T1 T2
    (baseline) (8 weeks) (6 months)
Socio-demographic data 20 x - - -
Insomnia severity (ISI) 7 x x x x
Work stress (IS, Subscale CI) 3 x x x x
Sleep effort (GSES) 7 - x x x
Sleep diary 10 - x x -
Adherence to sleep hygiene (SHI) 13 - x x x
Recuperation in sleep (items of SF-B) 7 - x x x
Sleep quality (item of PSQI) 1 - x x x
Effort reward imbalance (ERI-S) 10 - x - -
Depressive symptoms (ADS) 20 - x x x
Worrying (PSWQ-PW, ultra short) 3 - x x x
Recovery experiences (REQ) 16 - x x x
Recovery activities (ReaQ) 21 - x x x
Quality of life (SF-12) 12 - x x x
Presenteeism, absenteeism and health care utilization (TicP) Depends - x - x
Teacher self-efficacy (Teacher self-efficacy scale) 10 - - - x
Work engagement (UWES) 9 - x - -
User satisfaction 8 - - x -
  1. ADS Allgemeine Depressionsskala, CI Cognitive Irritation, ERI-S effort-reward imbalance – short version, GSES Glasgow Sleep Effort Scale, IS Irritation Scale, PSQI Pittsburgh Sleep Quality Index, PSWQ-PW Penn State Worry Questionnaire – Past Week, ReaQ Recovery experience and activities questionnaire, REQ Recovery Experience Questionnaire, SF-12 Short Form Health Survey – 12 items, SF-B Schlaffragebogen B, SHI Sleep Hygiene Index, TicP Trimbos/iMTA questionnaire for costs associated with Psychiatric illness, UWES Utrecht Work Engagement Scale.