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A Longitudinal Study of Aggression in People with Autism and Other Neurodevelopmental Disabilities.

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Title: A Longitudinal Study of Aggression in People with Autism and Other Neurodevelopmental Disabilities.
Authors: Gohari, Dena (AUTHOR), Schiltz, Hillary (AUTHOR), Lord, Catherine (AUTHOR)
Source: Journal of Autism & Developmental Disorders. Feb2026, Vol. 56 Issue 2, p464-480. 17p.
Subjects: Intellect, Statistical power analysis, Child psychopathology, Data analysis, Research funding, Autism, Participant observation, Interviewing, Questionnaires, Sample size (Statistics), Logistic regression analysis, Chi-squared test, Descriptive statistics, Aggression (Psychology), Longitudinal method, Statistics, One-way analysis of variance, Asperger's syndrome, Data analysis software, People with disabilities, Cognition, Psychosocial factors
Abstract: Aggression is common in autism and neurodevelopmental disorders, but longitudinal research on aggression is lacking. We longitudinally tracked aggression in 254 individuals from toddlerhood to emerging adulthood. Our sample included participants with a range of cognitive abilities, with 39.9% classified as more-cognitively-abled (MCA; IQ ≥ 70) and 60.1% as less-cognitively-abled (LCA; IQ < 70). Aggression Composite scores were derived from data from the autism diagnostic observation schedule, autism diagnostic interview-revised, and child behavior checklist at ages 2, 9, and 18. Fifty-four percent, 69%, and 42% of the sample showed aggression in toddlerhood, school age, and emerging adulthood, respectively. LCA individuals had higher rates of aggression in school age (80%) and emerging adulthood (58%) compared to MCA individuals (48 and 22%, respectively). Longitudinal aggression profiles revealed distinct patterns of change over time: 31% displayed persistent aggression, 25% increased, 23% decreased, and 13% never displayed aggression. Higher autism symptoms, lower VIQ, NVIQ, and less-developed adaptive skills correlated with more aggression cross-sectionally. Nonverbal IQ and repetitive behaviors related to aggression longitudinally: people in decreasing or absent profiles had higher NVIQ and fewer RRBs than those with persistent or increasing profiles. Participants with aggression at 9 were four times likelier to exhibit aggression at 18. Aggression is common in autism and NDDs, peaking around age 9, and declining in emerging adulthood. Patterns of change varied widely, with evidence that higher NVIQ and fewer RRBs may be protective. Findings have implications for clinical practices, highlighting important developmental periods and high-risk subgroups. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Autism & Developmental Disorders is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Aggression is common in autism and neurodevelopmental disorders, but longitudinal research on aggression is lacking. We longitudinally tracked aggression in 254 individuals from toddlerhood to emerging adulthood. Our sample included participants with a range of cognitive abilities, with 39.9% classified as more-cognitively-abled (MCA; IQ ≥ 70) and 60.1% as less-cognitively-abled (LCA; IQ &lt; 70). Aggression Composite scores were derived from data from the autism diagnostic observation schedule, autism diagnostic interview-revised, and child behavior checklist at ages 2, 9, and 18. Fifty-four percent, 69%, and 42% of the sample showed aggression in toddlerhood, school age, and emerging adulthood, respectively. LCA individuals had higher rates of aggression in school age (80%) and emerging adulthood (58%) compared to MCA individuals (48 and 22%, respectively). Longitudinal aggression profiles revealed distinct patterns of change over time: 31% displayed persistent aggression, 25% increased, 23% decreased, and 13% never displayed aggression. Higher autism symptoms, lower VIQ, NVIQ, and less-developed adaptive skills correlated with more aggression cross-sectionally. Nonverbal IQ and repetitive behaviors related to aggression longitudinally: people in decreasing or absent profiles had higher NVIQ and fewer RRBs than those with persistent or increasing profiles. Participants with aggression at 9 were four times likelier to exhibit aggression at 18. Aggression is common in autism and NDDs, peaking around age 9, and declining in emerging adulthood. Patterns of change varied widely, with evidence that higher NVIQ and fewer RRBs may be protective. Findings have implications for clinical practices, highlighting important developmental periods and high-risk subgroups. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Journal of Autism &amp; Developmental Disorders is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s10803-024-06559-0
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 17
        StartPage: 464
    Subjects:
      – SubjectFull: Intellect
        Type: general
      – SubjectFull: Statistical power analysis
        Type: general
      – SubjectFull: Child psychopathology
        Type: general
      – SubjectFull: Data analysis
        Type: general
      – SubjectFull: Research funding
        Type: general
      – SubjectFull: Autism
        Type: general
      – SubjectFull: Participant observation
        Type: general
      – SubjectFull: Interviewing
        Type: general
      – SubjectFull: Questionnaires
        Type: general
      – SubjectFull: Sample size (Statistics)
        Type: general
      – SubjectFull: Logistic regression analysis
        Type: general
      – SubjectFull: Chi-squared test
        Type: general
      – SubjectFull: Descriptive statistics
        Type: general
      – SubjectFull: Aggression (Psychology)
        Type: general
      – SubjectFull: Longitudinal method
        Type: general
      – SubjectFull: Statistics
        Type: general
      – SubjectFull: One-way analysis of variance
        Type: general
      – SubjectFull: Asperger's syndrome
        Type: general
      – SubjectFull: Data analysis software
        Type: general
      – SubjectFull: People with disabilities
        Type: general
      – SubjectFull: Cognition
        Type: general
      – SubjectFull: Psychosocial factors
        Type: general
    Titles:
      – TitleFull: A Longitudinal Study of Aggression in People with Autism and Other Neurodevelopmental Disabilities.
        Type: main
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            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
          Identifiers:
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              Value: 01623257
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              Value: 56
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            – TitleFull: Journal of Autism & Developmental Disorders
              Type: main
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