Table 1 Outcomes measures
| Â | Measure | Informant | T1 | T2 | T3 |
|---|---|---|---|---|---|
Primary outcomes | Creature counting: subtest of Test of Everyday Attention for Children [18], measures attentional control and switching | child | * | * | * |
Score!: subtest of Test of Everyday Attention for Children [18], measures sustained attention | child | * | * | * | |
Digit span: subtest of Wechsler Intelligence Scale for Children-III [19], measures verbal working memory | child | * | * | * | |
Span board: subtest of Wechsler Non Verbal [21], measures visual working memory | child | * | * | * | |
Word list interference: subtest from Nepsy-II-nl [20], this subtest is designed to asses verbal working memory, repetition and word recall following interference. | child | * | * | * | |
Six part test: subtest from Behavioural Assessment of the Dysexecutive Syndrome for Children [22], measures planning, task scheduling and performance monitoring | child | * | * | * | |
Inhibition: subtest from nepsy-II-nl [20], measures the ability to inhibit automatic responses in favor of novel responses and the ability to switch between respons types. | child | * | * | * | |
Behaviour Rating of Executive Functions (BRIEF): 70 item questionnaire designed to assess executive functioning in the home and school environments [23] | parent/teacher | * | * | * | |
Dictation (PI dictee, 16): measures spelling skills | child | * | * | * | |
Automated math (Tempo Test Automatiseren,15): measures degree of automation of addition, subtraction, multiplication and division. | child | * | * | * | |
Speed reading (Een Minuut Test, 17): measures technical literacy | child | * | * | * | |
Comprehension of instruction: subtest from nepsy-II-nl [20], measures the ability to receive, process and execute oral instructions of increasing syntactic complexity. | child | * | * | * | |
Secondary outcomes | Learning conditions test (Leervoorwaarden test, 24): 70 item questionnaire that measures directly and indirectly learning conditions as concentration, motivation, work rate, task orientation, working according to a plan, persistency, social position in class and relationship with peers and teacher. | teacher | * | * | * |
Child Behavior Checklist for Ages 6–18 (CBCL/6-18, 25): 113 item questionnaire designed to measure behaviour problems. | parent | * | * | * | |
Teacher’s Report Form for Ages 6–18 (TRF, 26): 113 item questionnaire designed to measure behaviour problems. | teacher | * | * | * | |
I-DISC-IV (Diagnostic Interview Schedule for Children, 27): structured diagnostic telephonic interview, registered via the internet. Measures presence of symptoms and criteria variables as defined by the DSM-IV [14]. Only the domains ADHD, ODD and CD are administered. | parent | * | Â | Â | |
Social Communication Questionnaire (SCQ, 28): is a quick screening questionnaire of 40 items for autism spectrum disorders. | parent | * | Â | Â | |
Kidscreen 27[29]: 27 item questionnaire that measures quality of life with the dimensions physical well-being, psychological well-being, autonomy & parents, peers & social support and school environment. | child/parent | * | * | * | |
Intelligence Quotient ** | Shortened version of Wechsler Intelligence Scale for Children III[19]: subtest Similarities, Block Design, Vocabulary and Information which gives an estimation of the Total IQ | child | * | Â | Â |