Table 4.

Quality assessment of internet- and mobile-based interventions.

Item		Study
		Brodbeck et al [41]	Dominick et al [38]	Eisma et al [35]	Van der Houwen et al [39]	Litz et al [40]	Kersting et al [33,34]	Wagner et al [36]
Indication
	Is the intended purpose of the intervention clearly stated (which psychological symptoms can be alleviated by the intervention, orientation toward current version of the ICDa and empirical evidence regarding the intervention)?	Yes	Unclear	Unclear	Unclear	Unclear	Yes	Unclear
Description of the intervention
	Is the intervention based on evidence-based theories and techniques of psychotherapy? Are these theories and techniques clearly stated?	Yes	Yes	Yes	Yes	Yes	Yes	Yes
	Information whether intervention is guided or unguided	Yes	No	Yes	Yes	Yes	Yes	Yes
	If guided, is there information on the type and content of guidance and who initiates contact?	Yes	N/Ab	Yes	N/A	Yes	Yes	Yes
	Information on how often or how frequently the intervention should be used, possible prerequisites	Yes	No	Yes	Yes	Yes	Yes	Yes
Qualification
	Was the intervention developed by registered psychotherapists or specialists in the field of psychiatry, psychotherapy, or psychosomatic medicine or affected parties? Is their possible involvement clearly stated?	Yes	Yes	Yes	Yes	Yes	Yes	Yes
	Exclusion of participants with full-blown disorders (eg, severe depression and suicidal ideation)	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Effectiveness
	Use of intention-to-treat analyses to estimate effects	Yes	No	Yes	Yes	Yes	Yes	Yes
	Between-group Cohen d is reported for primary outcome (determined in advance)	Yes	No	Yes	Yes	Yes	Yes	Yes
	Has the trial been registered in a clinical trial register?	Yes	No	No	No	Yes	Yes	No
Safety of patients
	Advice on handling of crises (eg, referring to professional care with face-to-face contact); if people with full-blown disorders are included: assessment of emergencies and immediate reference to professional help	Yes	Yes	No	No	No	Yes	No
	Provision of information on potential funding sources and their role in the conduction of the study	Yes	Yes	Yes	No	Yes	Yes	No
Number of criteriac fulfilled (n=12), n (%)		12 (100)	5 (42)	9 (75)	7 (58)	10 (83)	12 (100)	8 (67)

^aICD: International Statistical Classification of Diseases and Related Health Problems.

^bN/A: not applicable.

^cQuality criteria based on the study by Klein et al [1].