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Gepubliceerd in: Journal of Autism and Developmental Disorders 9/2022

08-09-2021 | Original Paper

The Impact of Birth Order on Language Development in Autistic Children from Simplex Families

Auteurs: Tyler C. McFayden, Megan Fok, Thomas H. Ollendick

Gepubliceerd in: Journal of Autism and Developmental Disorders | Uitgave 9/2022

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Abstract

The current study investigated the impact of birth order on vocabulary and social language development in 1338 first-born and 1049 s-born autistic youth (M age = 9.03 years, SD = 3.57; 86.4% male) from the Simons Simplex Collection. Frequentist and Bayesian analyses revealed mixed findings in language development. There were no differences in vocabulary or social language between first-born and second-born children. However, birth order and income together predicted expressive vocabulary and inappropriate speech such that birth order had a greater impact on language in lower-income families. This is the first study to investigate the impact of birth order on language outcomes in autistic youth and has implications for early intervention in lower-resourced communities.
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Voetnoten
1
Identity-first language is used throughout to be consistent with clinical and research recommendations (Bottema-Beutel et al., 2021; Kenny et al., 2016). Furthermore, in adherence to Bottema-Beutel’s recommendations on inclusive language, typically-developing samples are referred to as “non-autistic” or “non-clinical” samples.
 
2
The other two subscales in the Communication Domain (i.e., Receptive Language and Written Language) were not included in the current study.
 
3
Standard scores for FSIQ, VIQ, and NVIQ consisted of either a Deviation IQ (i.e., the standard score provided by the test’s normed references) or a Ratio IQ (i.e., their average subtests age-equivalent scores divided by their chronological age multiplied by 100). Deviation IQ scores were prioritized when available; however, if a participant was unable to establish basal on their cognitive test, then a Ratio IQ was reported instead (Bal et al., 2016; Bishop et al., 2011). In the current sample, n = 530 (19.2%) of the VIQ scores and n = 406 (14.7%) of the NVIQ scores were derived from Ratio IQs.
 
4
These same results held when considering a restricted age range of autistic youth (ages 4–6 years), and when analyzing a verbal subgroup group only (defined two ways: (1) FSIQ > 70, (2) VIQ > 80).
 
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Metagegevens
Titel
The Impact of Birth Order on Language Development in Autistic Children from Simplex Families
Auteurs
Tyler C. McFayden
Megan Fok
Thomas H. Ollendick
Publicatiedatum
08-09-2021
Uitgeverij
Springer US
Gepubliceerd in
Journal of Autism and Developmental Disorders / Uitgave 9/2022
Print ISSN: 0162-3257
Elektronisch ISSN: 1573-3432
DOI
https://doi.org/10.1007/s10803-021-05274-4

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