Characteristics of study populations in articles on measurement properties.

ADIS: Anxiety Disorders Interview Schedule. MASC: Manifest Anxiety Scale for Children. RCADS: Revised Child Anxiety and Depression Scale. RCMAS: Revised Child Manifest Anxiety Scale. SCARED: Screen for Child Anxiety and Related Emotional Disorders. SCAS: Spence Children's Anxiety Scale. SWQ: Social Worries Questionnaire. CGI: Clinical Global Impressions.X = No details. M = male; F = female. C: child; P: parent. AS: Asperger Syndrome. ASD: autism spectrum disorder. CBT: cognitive behaviour therapy. HFASD: high-functioning ASD. OCD: obsessive-compulsive disorder. T1 = Time 1; T2 = Time 2.looked at cross ethnic validity (all participants African American); ** looked at cross ethnic validity (all participants African American or non Hispanic white); *** Data collected from 5 European countries – details are for UK sample.