Efficacy and cost-effectiveness of an unguided, internet-based self-help intervention for social anxiety disorder in university students: protocol of a randomized controlled trial

Table 2 Measurements and time of assessment

Instrument	Abbreviation	Aim	Time of assessment
Instrument	Abbreviation	Aim	t0	t1	t2
Clinician administered
Structured Clinical Interview for DSM-IV Axis I Disorders	SCID-I	DSM-IV Axis I disorders	✔		✔
Self-report ratings
Primary Outcome Measure
Social Phobia Scale^a	SPS	Symptoms of SAD	✔	✔	✔
Social Interaction Anxiety Scale^a	SIAS	Symptoms of SAD	✔	✔	✔
Secondary Outcome Measure
Liebowitz Social Anxiety Scale	LSAS-SR	Social anxiety symptoms	✔	✔	✔
Beck Depression Inventory II	BDI-II	Symptoms of depression	✔	✔	✔
Brief Symptom Inventory	BSI	Psychiatric symptoms	✔	✔	✔
Inventory of Interpersonal Problems	IIP-64	Interpersonal problems	✔	✔	✔
Fear of Positive Evaluation Scale	FPES	Fear of positive evaluation	✔	✔	✔
Disqualification of Positive Social Outcomes Scale	DPSOS	Fear of positive evaluation	✔	✔	✔
EuroQol (EQ-5D-5 L)	EQ-5D-5 L	Quality of life	✔	✔	✔
Assessment of Quality of Life (AQol)	AQoL-8D	Quality of life	✔	✔	✔
Client Satisfaction Questionnaire	CSQ-8	Client satisfaction
Trimbos/iMTA Questionnaire for Costs associated with Psychiatric Illness	TiC-P	Cost-effectiveness	✔		✔
Credibility Expectancy Questionnaire	CEQ	Treatment expectancy

t0 Baseline; t1 10 weeks; t2 6 months; Assessments ✔ = intervention and control group; = intervention group ^a process measures assessed every 2 weeks

ISSN: 1471-244X