Environmental scan of Canadian and UK policies for autism spectrum disorder diagnostic assessment.

OBJECTIVES: Many jurisdictions across Canada and internationally are grappling with providing diagnostic and intervention services for children with autism spectrum disorder (ASD). The objective was to compare Canadian and United Kingdom (UK) policies governing ASD diagnosis. METHODS: The policy scan extended from January 2000 to December 2017. Canadian federal, provincial/territorial, and UK government publications related to ASD diagnosis were retrieved from official websites by searching for ASD and related terms. Retrieved documents were filtered for relevance, with all relevant documents undergoing full text review. Data extracted included personnel and testing requirements for diagnosis, wait times, and eligibility for ASD services and funding. RESULTS: The included jurisdictions varied substantially in their approach to ASD diagnosis and eligibility for intervention. Nine of the 13 provinces/territories restrict which clinicians can diagnose ASD by requiring certain documentation for service eligibility. Three provinces require multi-disciplinary team assessment (British Columbia [BC], Quebec, and Nova Scotia [NS]). Three provinces (BC, NS, and Prince Edward Island [PEI]) require specific diagnostic tests for diagnosis. Only two provinces, BC and NS, have target wait times for assessment. Jurisdictions differed in whether they allowed children with a provisional diagnosis of ASD to access services. At a national level, the UK provides more clinical guidance for ASD diagnosis, which can be attributed to its centralized system of national healthcare delivery. CONCLUSIONS: ASD diagnostic assessment policies vary across Canada, and between Canada and the UK. Further evidence supporting ASD diagnostic practices is needed to streamline the journey from identification to intervention.

Concordance of Diagnosis of Autism Spectrum Disorder Made by Pediatricians vs a Multidisciplinary Specialist Team.

Importance: Wait times for autism spectrum disorder (ASD) diagnosis are lengthy because of inadequate supply of specialist teams. General pediatricians may be able to diagnose some cases of ASD, thereby reducing wait times. Objective: To determine the accuracy of ASD diagnostic assessments conducted by general pediatricians compared with a multidisciplinary team (MDT). Design, Setting, and Participants: This prospective diagnostic study was conducted in and a specialist assessment center in Toronto, Ontario, Canada, and Ontario general pediatrician practices from June 2016 to March 2020. Children were younger than 5.5 years, referred with a developmental concern, and without an existing ASD diagnosis. Data analysis was performed from October 2021 to February 2022. Exposures: The pediatrician and MDT each conducted blinded assessments and recorded a decision as to whether the child had ASD. Main Outcomes and Measures: Main outcomes included sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV). A logistic regression was performed to identify factors associated with accurate pediatrician assessment for children with or without an ASD diagnosis. Results: Seventeen pediatricians (12 women [71%]) participated in the study and referred 106 children (79 boys [75%]; mean [SD] age, 41.9 [13.3] months). Sixty participants (57%) were from minoritized racial and ethnic groups (eg, Black, Asian, Hispanic, Middle Eastern, and multiracial). Seventy-two participants (68%) received a diagnosis of ASD by the MDT. Sensitivity and specificity of the pediatrician assessments compared with MDT were 0.75 (95% CI, 0.67-0.83) and 0.79 (95% CI, 0.62-0.91), respectively. The PPV of the pediatrician assessments was 0.89 (95% CI, 0.80-0.94) (ie, 89% agreement with the MDT), and NPV was 0.60 (95% CI, 0.49-0.70) (ie, 60% agreement with the MDT). Higher pediatrician certainty (odds ratio [OR], 3.33; 95% CI, 1.71-7.34; P = .001) was associated with increased diagnostic accuracy for children with ASD. Lower accuracy was seen for children with higher Visual Reception subscale developmental skills (OR, 0.93; 95% CI, 0.89-0.97; P = .001), speaking abilities (OR, 0.17; 95% CI, 0.03-0.67; P = .03), and White race (OR, 0.32; 95% CI, 0.10-0.97; P = .04). Age, gender, and Autism Diagnostic Observation Schedule, 2nd Edition composite scores were not significantly associated with the accuracy of assessments. All 7 children with a sibling with ASD received an accurate diagnosis; otherwise, no significant factors were identified for accuracy in children without ASD. Conclusions and Relevance: This study of concordance of autism assessment between pediatricians and an expert MDT in young children found high accuracy when general pediatricians felt confident and lower accuracy when ruling out ASD. These findings suggest that children with co-occurring delays may be potential candidates for community assessment.

Psychometric properties of a parent- and teacher-report measure for autistic children: Parent-Teacher Relationship Quality Scale (PTRQS).

Parent-teacher relationship (PTR) quality is linked to child and family-school functioning and may be especially important in the school adjustment of autistic children. However, measurement of PTR quality has been limited by inconsistency in the use of measures, a paucity of two-informant measurement, and limited psychometric consideration. We examined the psychometric properties of the Parent-Teacher Relationship Quality Scale (PTRQS), a parent- and teacher-report measure of PTR quality derived from multiple sources. Specifically, we examined the factor structure, reliability, and convergent validity of the PTRQS among parents and teachers of 192 autistic children in preschool to 2nd grade. Results supported a three-factor model, including (1) parent-perceived relationship quality, (2) teacher-perceived comfort with parent(s), and (3) teacher perceptions of parent abilities. Scores exhibited high internal consistency. As evidence of convergent validity, all three factors of PTR quality, as well as the total PTRQS score, were strongly associated with parent interview-based PTR quality, parent perceptions of teacher effectiveness, and teacher-rated parental school involvement. The two teacher-rated PTR quality factors were also associated with student-teacher relationship quality. Results indicated that (a) the measure can validly capture PTR quality in the context of preschool and early elementary-age autistic children, (b) early PTR quality is linked to parental involvement, and (c) teacher-rated PTR factors are linked to autistic students' own relationships with their teachers. The results have implications for researchers and school psychologists measuring PTR quality in their practice.

Systematic review of clinical guidance documents for autism spectrum disorder diagnostic assessment in select regions.

Clinical guidance documents play an important role in ensuring access to high-quality autism spectrum disorder diagnostic assessment practices. The objective was to perform a systematic review of professional association and government clinical guidance documents for autism spectrum disorder diagnostic assessment, analyzing their quality and content. The government search was limited to English-speaking, single-payer, publicly funded health systems. A quality appraisal was conducted by two appraisers using the Appraisal of Guidelines Research and Evaluation, second edition tool. A content analysis was conducted for recommended clinical personnel and psychometric tools. The 11 documents demonstrated higher quality in Scope and Purpose (mean: 90.1, standard deviation: 7.4) and Clarity of Presentation (mean: 82.8, standard deviation: 9.4) and lower quality in Applicability (mean: 43.3, standard deviation: 23.8) and Rigor of Development (mean: 52, standard deviation: 21.9). All documents either recommended multidisciplinary team assessment or stated it was ideal. The documents varied substantially in their recommended tools and personnel for diagnostic assessment. There was little supporting evidence for team and personnel recommendations. Multiple guidance documents exist for autism spectrum disorder diagnostic assessments, with varying quality and recommendations. The substantial variation likely stems from insufficient evidence supporting assessment practices. Research is required to close the evidence gaps and inform high-quality clinical guidelines.