Fig. 2

SPIRIT 2013 schedule of enrolment, interventions, and assessmentsAbbreviations: 0-wk = 0 weeks in to treatment, the equivalent of the treatment start; 3FU-12FU = assessment points 3-12 months after the end of treatment; 3-wk-5wk = assessment points 3-5 weeks in to treatment; AQ-10 = Autism Spectrum Quotient, 10-item version; BIP TIC = therapist-guided internet-delivered behaviour therapy (exposure with response prevention) for children and adolescents with Tourette syndrome or chronic tic disorder; C&A-GTS-QOL = Child and Adolescent Gilles de la Tourette Syndrome–Quality of life scale; CGAS = Children’s Global Assessment Scale; CGI-I = Clinical Global Impression – Improvement scale; CGI-S = Clinical Global Impression – Severity scale; comparator = therapist-guided internet-delivered education for children and adolescents with Tourette syndrome or chronic tic disorder; iiPAS = Internet Intervention Patient Adherence Scale; MINI-KID = Mini-International Neuropsychiatric Interview for children and adolescents; OCD-RD =obsessive-compulsive and related disorders; OCI-CV = Obsessive-Compulsive Inventory – Child version; PTQ = Parent Tic Questionnaire; post = post-treatment, assessment point directly after the end of treatment; PUTS = Premonitory Urge for Tics Scale; SMFQ-C = Short Mood and Feelings Questionnaire – Child version; SMFQ-P = Short Mood and Feelings Questionnaire – Parent version; SNAP-IV = Swanson, Nolan, and Pelham rating scale; TiC-P = Trimbos/iMTA questionnaire for costs associated with psychiatric illness; WAI-C = Working Alliance Inventory – Child version; WAI-P = Working Alliance Inventory – Parent version; YGTSS = Yale Global Tic Severity Scale; YGTSS-TTSS = Yale Global Tic Severity Scale – Total tic severity score