Abstract

Autism Diagnostic Interview-Revised (ADI-R) is one of the most widely used standardized diagnostic instruments for autism spectrum disorder (ASD). This article presents findings from the validation of the Polish version of the Autism Diagnostic Interview-Revised (ADI-R-PL), including new algorithms for toddlers and preschoolers. The validation group consisted of 125 participants: 65 with Autism Spectrum Disorder (ASD group) and 60 in the control group, including individuals with non-ASD disorders and typical development. The normalization group consisted of 178 participants, including 118 with ASD. The ADI-R-PL was found to have good psychometric properties. Confirmatory factor analysis supported both a bifactor structure and three-factor model. The study has generated preliminary information about the psychometric properties of the new algorithms for toddlers and young preschoolers. To the best of our knowledge, this paper is the first to propose new cutoffs in three ADI-R domains for a non-English-speaking population.

Highlights

  • Autism spectrum disorder (ASD) is a heterogeneous neurodevelopmental disorder whose prevalence has risen significantly in recent years, currently reaching or exceeding 1% worldwide [1, 2]

  • This paper presents findings from the validation of the Polish version of the Autism Diagnostic Interview-Revised (ADI-R, [14]), a standardized parent/caregiver autism spectrum disorder (ASD) diagnostic interview protocol

  • As for the domains from the algorithms for toddlers, excellent intraclass correlation coefficients (ICCs) were obtained for RRBs (0.91) and Total Score (0.83) for the SW21–47 algorithm, satisfactory for the SA, SC, RRBs, and Reciprocal and Peer Interactions (RPI) domains (0.62–0.79), and moderate for Total Score in the PH21–47 algorithm (0.55, Table 4)

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Summary

Introduction

Autism spectrum disorder (ASD) is a heterogeneous neurodevelopmental disorder whose prevalence has risen significantly in recent years, currently reaching or exceeding 1% worldwide [1, 2]. The clinical judgment of experienced clinicians informed by standardized diagnostic instruments is the best predictor of stable and reliable ASD diagnoses [4]. In Poland, as in other countries in Central and Eastern Europe, the availability of validated instruments for diagnosing ASD remains problematic [5, 6]. This is a major obstacle for the development of diagnostic standards, many facilities aim to follow the best practice guidelines of a comprehensive diagnostic evaluation for autism [7]. Professionals tend to use nonstandardized protocols of parent/caregiver interviews and unstructured observation with

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