Table 1.

Study schedule of measurement and testing

	T0a Eligibility	T0 Baseline	Each session	T1 Mid-intervention	T2 Postintervention	T3 and T4 Follow-up
Approximate time	1 week			After 2 weeks	After 4 weeks	6 weeks after T2	6 months after T2
Consent	X
AICA-S (primary outcome)	X	X		X	X	X	X
Demographics	X
Lifestyle parameter		X			X	X	X
MINI		X
AICA-SKI:IBS		X			X
Treatment information		X
iSOCRATES		X		X	X	X	X
CIUS		X		X	X	X	X
EQ-5D-5L		X			X	X	X
PHQ-9		X			X	X	X
GAD-7		X			X	X	X
L-1		X			X	X	X
SWE		X			X	X	X
BFI-10		X
Resource use		X			X	X	X
Satisfaction			X		X
Mood			X
HAQ				X	X
SUS					X

AICA-S, Assessment of Internet and Computer Game Addiction Scale; AICA-SKI:IBS, Assessment of Internet and Computer Game Addiction–Structured Clinical Interview; BFI-10, Big Five Inventory 10-item version; CIUS, Compulsive Internet Use Scale; EQ-5D-5L, EuroQoL Standardised Measure of Health-related Quality of Life–5 Dimensions, 5-Level version; GAD-7, Generalized Anxiety Disorder Screener 7-item version; HAQ, Helping Alliance Questionnaire; iSOCRATES, Stages of Change Readiness and Treatment Eagerness Scale for Internet–Addiction; L-1, General Life Satisfaction 1-item version; MINI, Mini-International Neuropsychiatric Interview; PHQ-9, Patient Health Questionnaire 9-item version; SUS, System Usability Scale; SWE, Self-Efficacy Scale.