103 SCOPE study design 5 Table 2. Outcome measures from baseline to follow-up Measurement Timea Instrument Informant Blind to group status? Descriptives Demographics IQ Problem behavior Parental ASD symptoms T1 T1 T1 T1 Single questions Bayley-III BITSEA SOV Parent(s) Clinician Parent(s) Parent(s) Primary outcome Joint engagement T1, T2, T3 JERI Research assistant (RA) b Yes Secondary outcome Change in ASD symptoms T1, T2, T3 T1, T3 T1, T3 BOSCC (parent) BOSCC (clinician) ADOS-2 RA b RAc Clinician Yes Yes Yes Expressive language T1, T2, T3 T1, T3 JERI N-CDI RA b Parent(s) Yes Adaptive functioning T1, T3 Vineland Screener Parent(s) Parental well-being T1, T2, T3 T1, T2, T3 WEMWBS PSQ Parent(s) Parent(s) Yes Parental skills T1,T2, T3 JERI RA b Satisfaction T2 T2 T3 BESTE-O BESTE-H Satisfaction survey Parent(s) BEAR professional Parent(s) Cost measurements T1, T2, T3 Tic-P Parent(s) Bayley-III Bayley Scales of Infant and Toddler Development, BITSEA Brief Infant–Toddler Social & Emotional Assessment-Revised, SOV Dutch version of the Autism Quotient (AQ), JERI Joint Engagement Rating Inventory, BOSCC Brief Observation of Social Communication Change, ADOS-2 Autism Diagnostic Observation Schedule, N-CDI Dutch version of the MacArthur Communicative Development Inventory, Vineland Screener adapted version of the Vineland Adaptive Behaviour Scales, WEMWBS Warwick-Edinburgh Mental Well-being Scale, PSQ Parenting Stress Questionnaire (PSQ, in Dutch Opvoedingsbelastingsvragenlijst), BESTE the Rating Scale Satisfaction and Effect questionnaire, Tic-P Trimbos and iMTA questionnaire on Costs associated with Psychiatric illness a T1 is baseline; T2 is endpoint, eight weeks after baseline; T3 is follow-up, 24 weeks after endpoint b Both the JERI and the BOSCC(parent) are assessed by the BEAR professional as part of the intervention (only at T1 and T2). At T3, both measurements are assessed by a researcher of the SCOPE project. All data will be coded by research assistants who are unaware of treatment allocation c The BOSCC(clinician) is assessed by a professional examiner. Data will be coded by research assistants who are unaware of treatment allocation
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