Table 2 Supplementary information: rating scales and clinical interviews that are commonly used in the UK (those that are free of charge are indicated with an asterisk)

Autism-specific rating scales

• Social Communication Questionnaire (SCQ) for use with mental age of 2+ [63]

• Social Responsiveness Scale SRS-2 (age 2½ +) [64]

• Social and Communication Disorders Checklist (SCDC) (3–19 years) [65]

ADHD-specific rating scales

• Conners’ Comprehensive Behavior Rating Scales (CBRS) to identify ADHD and comorbid conditions (6–18 years) [66]

• Conners’ Adult Rating Scales (CAARS) (age 18+) [67]

• SNAP-IV Rating Scale* (6–18 years) [68]

• Adult ADHD Self-report Rating Scale (ASRS)* (age 18+) [69]

• RATE and RATE-C self- and informant-report scales* (for children 8–11 years and adults 16–54 years) [70]

• The Vanderbilt ADHD Diagnostic Rating Scale (VADRS) [71, 72]

Rating scales suitable for both ASD and ADHD

• Kiddie-SADS DSM-5 Screen Interview (K-SADS-PL)* (6–18 years) [73, 74]

• Strengths and Difficulties Questionnaire (SDQ) (2–17 years) [75]

• The Development and Well-being Assessment (DAWBA) (5–17 years) [76, 77]

Autism-specific clinical interviews

• Diagnostic Autism Spectrum Interview (DASI)* (age > 2) [78]

• Autism Diagnostic Interview-Revised (ADI-R) (age > 2) [79]

• Diagnostic Interview for Social Communication Disorders (DISCO) (age range unspecified) [80]

• Developmental, Dimensional and Diagnostic Interview [3Di] (highly structured computerised interview; > 2 years) [81]

ADHD-specific clinical interviews

• ADHD Child Interview (ACE)* and the adult version, ACE+* (5–16 and > 16 years respectively [82, 83]

• Diagnostic Interview of Adult ADHD (DIVA-2)* (lower age limit not specified) [84]

Clinical interviews suitable for both ASD and ADHD

• The Development and Well-being Assessment (DAWBA) (5–17 years) [76, 77]