What do we not know (yet) about recovery colleges? A study protocol on their (cost-)effectiveness, mechanisms of action, fidelity and positioning

Table 1 Overview of all variables of interest and its matching instruments as used in Study 1

Measurement level	Variable of interest	Instrument	Reference
Primary	Empowerment	NEL	Boevink, Kroon (49)
Secondary	Quality of life	Maastricht QoL	Drukker, Bak (51)
	Mental health	MHI-5 (from RAND-36)	Berwick, Murphy (52)
	Loneliness	DeJong Gierveld Loneliness Scale	de Jong-Gierveld and Van Tilburg (54)
	Satisfaction with care and support	Adapted inventory	Menting (56)
	Self-stigma	ISMI-10	Boyd, Otilingam and DeForge (57)
Economic evaluation	Resource use	TiC-P	Hakkaart-Van Roijen (58)
	Quality-adjusted life years	EQ-5D-5 L	Rabin and Charro (59)

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