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Journal of Autism and Developmental Disorders

Gepubliceerd in:

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

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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The other two subscales in the Communication Domain (i.e., Receptive Language and Written Language) were not included in the current study.

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.

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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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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