Table 2.

Study measures

Construct	Measure	Sourcea	T1b	T2c	T3d
Primary Outcome
Anxiety diagnoses	Anxiety Disorders Interview Schedule for Children V: Separation, Social, & Generalised Anxiety Disorder [27].	P	x	x	x
Secondary Outcomes
Anxiety symptoms and impact	Spence Children’s Anxiety Scale: Child (44-item) and parent (38-item) reported anxiety symptoms [31].	P, C	x	x	x
	School Anxiety Scale: 16-items assessing anxiety symptoms at school [32].	T	x	x	x
	Child’s Anxiety Life Interference Scale: Child (9-items) and parent (16-items) report [33].	P, C	x	x	x
ADHD	ADHD Rating Scale IV: 18-item validated scale measuring the core symptoms of ADHD [26].	P, T	x	x	x
Behavior	Strengths and Difficulties Questionnaire: 25-items assessing child behavior and peer problems [34].	P, T, C	x	x	x
Irritability	Affective Reactivity Index: A 6-item validated measure assessing child irritability [35].	P	x	x	x
QoL	Child Health Utilities Index Nine Dimension: Preference-based measure of health-related QoL [36, 37].	P, C	x	x	x
Sleep	Single item primary caregiver report of whether the child’s sleep is a problem (none, mild, moderate or severe) [38].	P	x	x	x
School attendance	Number of days late/missed [38].	P	x	x	x
Cognitive function	NIH Toolbox Cognition Battery: Computer- administered assessment of cognitive and executive function, attention, episodic/working memory, and processing speed [39].	D	x	x	x
Parent mental health	Kessler 6 (K6): A 6-item validated measure of adult psychological stress resulting in a total score range from no distress to severe distress [40].	P	x	x	x
Parenting	Parenting behavior: Scales assessing parenting consistency (6-items) and warmth (6-items) [41].	P	x	x	x
Work attendance	Number of days late/missed [38].	P	x	x	x

^a P = parent report, T = teacher report, C = child report (completed face-to-face), D = direct assessment; ^b T1 = baseline; ^c T2 = 5 months post-randomisation; ^d T3 = 12 months post-randomisation