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Validity of Self-Report and Informant Rating Scales of Adult ADHD Symptoms in Comparison With a Semistructured Diagnostic Interview

Landspítali University Hospital, Reykjavík, pama{at}landspitali.is

Jakob Smári

University of Iceland, Reykjavík

Dagbjörg Sigurðardóttir

Landspítali University Hospital, Reykjavík

Gísli Baldursson

Landspítali University Hospital, Reykjavík

Jón Sigmundsson

deCODE Genetics, Reykjavík

Kristleifur Kristjánsson

deCODE Genetics, Reykjavík

Solveig Sigurðardóttir

State Diagnostic and Counseling Center, Kópavogur

Stefán Hreiðarsson

State Diagnostic and Counseling Center, Kópavogur

Steingerður Sigurbjörnsdóttir

State Diagnostic and Counseling Center, Kópavogur

Ólafur Ó. Guðmundsson

Landspítali University Hospital, Reykjavík

In a study of ADHD symptoms in the relatives of probands diagnosed with ADHD, the validity of self-reported and informant-reported symptoms in childhood and adulthood was investigated with a semistructured diagnostic interview, the Schedule for Affective Disorders and Schizophrenia for School-Age Children (K-SADS) adapted for adults, as a criterion. The participating relatives were 80 women and 46 men aged 17 to 77. Rating scales based on the Diagnostic and Statistical Manual of Mental Disorders (4th ed.) were completed by participants and informants. Internal consistency of the scales and interrater reliabilities of the diagnostic interview were satisfactory. Correlations between ratings across sources of information supported convergent and divergent validity. Self-report scales and informant scales predicted interview-based diagnoses in childhood and adulthood with adequate sensitivities and specificities. It was concluded that the rating scales have good psychometric properties, at least in at-risk populations.

Key Words: adult ADHD • relatives • rating scales • K-SADS

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