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

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

	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	-

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.

ISSN: 1745-6215