Openly accessible

Autism spectrum disorder: updated prevalence and comparison of two birth cohorts in a nationally representative Australian sample

May, Tamara, Sciberras, Emma, Brignell, Amanda and Williams, Katrina 2017, Autism spectrum disorder: updated prevalence and comparison of two birth cohorts in a nationally representative Australian sample, BMJ open, vol. 7, no. 5, pp. 1-9, doi: 10.1136/bmjopen-2016-015549.

Attached Files
Name Description MIMEType Size Downloads
sciberras-autismspectrum-2017.pdf Published version application/pdf 640.10KB 154

Title Autism spectrum disorder: updated prevalence and comparison of two birth cohorts in a nationally representative Australian sample
Author(s) May, TamaraORCID iD for May, Tamara orcid.org/0000-0001-8705-4180
Sciberras, EmmaORCID iD for Sciberras, Emma orcid.org/0000-0003-2812-303X
Brignell, Amanda
Williams, Katrina
Journal name BMJ open
Volume number 7
Issue number 5
Article ID e015549
Start page 1
End page 9
Total pages 9
Publisher BMJ Publishing Group
Place of publication London, Eng.
Publication date 2017-05-01
ISSN 2044-6055
Keyword(s) Autism Spectrum Disorder
ASD
epidemiology
prevalence
social-communication impairment
repetitive patterns of behaviour
etiological causes
Summary Objectives This study aimed to (1) provide an update on the prevalence of parent-reported autism spectrum disorder (ASD) diagnosis and new information about teacher-reported ASD in two nationally representative Australian cohorts at ages 10–11 years, (2) examine differences in cohort demographic and clinical profiles and (3) compare the prevalence of teacher-reported ASD and any changes in categorisation over time across the cohorts.

Design
Secondary analyses were undertaken using data from the Longitudinal Study of Australian Children (LSAC).

Participants Children were recruited at kindergarten age (K cohort; birth year 1999/2000) and birth (B cohort; birth year 2003/2004), with follow-up of every 2  years for six waves.

Primary outcome measures
Parent-reported and teacher-reported ASD diagnosis was ascertained at three time points (waves 4–6).

Results
At age 10–11 years, the adjusted prevalence of parent-reported ASD diagnosis was 3.9% (95% CI 3.2 to 4.5) and 2.4% (95% CI 1.6 to 2.9) in the B and K cohorts, respectively. Teacher-reported prevalence of ASD was 1.7% (95% CI 1.2 to 2.1) in the B cohort and 0.9% (95% CI 0.56 to 1.14) in the K cohort. Parents reported fewer conduct and peer problems and teachers more pro-social behaviour in B relative to K cohort ASD children. Children reported only by parents in the later-born B cohort had milder behaviour problems than parent-agreed and teacher-agreed cases. Although individual switching to ASD from other categories from 8–9 to 10–11 years was low (K cohort n=5, B cohort n=6), teachers reported more children with ASD in the B than K cohort at 10–11 years and fewer children with emotional/ behavioural problems.

Conclusions The higher prevalence of parent-reported and teacher-reported ASD diagnosis in the later-born cohort may be partially explained by identifying children with milder behavioural problems as ASD and a change in the use of diagnostic categories in schools.
Language eng
DOI 10.1136/bmjopen-2016-015549
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution non-commercial licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30100103

Document type: Journal Article
Collections: School of Psychology
Open Access Collection
Connect to link resolver
 
Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved.

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.

Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 3 times in TR Web of Science
Scopus Citation Count Cited 4 times in Scopus
Google Scholar Search Google Scholar
Access Statistics: 84 Abstract Views, 154 File Downloads  -  Detailed Statistics
Created: Wed, 26 Jul 2017, 14:26:13 EST

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.