Cost-effectiveness of i-Sleep, a guided online CBT intervention, for patients with insomnia in general practice: protocol of a pragmatic randomized controlled trial

Table 2 Measurements and instruments at different point of assessment

Measurement	Instrument	Baseline (T0)	T1, T2 and T3 (at 8, 26 and 52 weeks)
Background characteristics	n/a	X	-
History of insomnia	n/a	X
Alcohol use	AUDIT	X	X
Insomnia severity	ISI	X	X
Anxiety and depression	HADS	X	X
Daytime insomnia consequences	Espie et al., 2012	X	X
Daytime functioning	WSAS	X	X
Fatigue	FSS	X	X
Quality of life	EQ-5D-5 L	X	X
Healthcare utilization & work absenteeism	TiC-P	X	X
Treatment satisfaction	n/a	-	T1
Actigraphy	Actigraph GT9X Link	X	X
Sleep diary	Consensus diary	X	X
Sleep medication	n/a	X	X

AUDIT: Alcohol Use Disorders Identification Test; ISI: Insomnia Severity Index; HADS: Hamilton Anxiety and Depression Scale; WSAS: Work and Social Adjustment scale; FSS: Fatigue Severity Scale; EQ-5D-L: EuroQoL; TiC-P: Trimbos and iMTA questionnaire on Costs associated with Psychiatric Illness

ISSN: 1471-244X