Adult Autism Spectrum Quotient (AQ-10) – Self-administered

Abstract

The Adult Autism Spectrum Quotient (AQ-10) is a highly efficient, 10-item screening instrument designed for self-administration in adults. Developed by Allison and colleagues in 2012, it serves as a rapid method to identify individuals exhibiting a high concentration of traits associated with Autism Spectrum Disorder (ASD). As a shortened version of the original 50-item AQ, the AQ-10 maintains strong psychometric properties while significantly reducing administration time in clinical and research settings.

The instrument’s primary purpose is not diagnostic but rather to act as a triage tool. A score above the established cutoff indicates the need for a referral to a specialist for a detailed clinical evaluation, distinguishing it as a valuable first-stage screening measure in large-scale population studies and clinical intake procedures.

Keywords

Autism Spectrum Quotient, AQ-10, ASD, Screening Tool, Self-report, Adult Autism, Baron-Cohen, Diagnostic Assessment, Psychometrics.

Authors

Allison C, Auyeung B, Baron-Cohen S.

Purpose

The core purpose of the AQ-10 is to serve as a fast and effective screening instrument for autistic traits in the adult population. It is specifically designed to maximize sensitivity and specificity compared to the longer AQ-50, ensuring that potential cases of ASD are not overlooked in initial assessments or primary care settings.

The established scoring threshold (a score greater than 6 out of 10) acts as a clear indicator for clinicians, prompting immediate referral for a more comprehensive and intensive diagnostic assessment carried out by specialists. This rapid screening capability helps streamline clinical resources and prioritize individuals most likely to meet diagnostic criteria.

Construct

The AQ-10 measures the underlying psychological construct of the degree of autistic traits present in an individual, consistent with the broader conceptualization of the Autism Spectrum Quotient. These traits span critical domains often affected by ASD, including difficulties in social communication, challenges in shifting attention, heightened sensory sensitivity, and preference for systematizing or collecting information.

While the original AQ-50 was designed to measure five specific subscales, the streamlined AQ-10 aims to capture the overall severity of these traits efficiently, focusing on the 10 items that best discriminate between individuals with and without a clinical diagnosis of ASD, thereby yielding a highly predictive total score.

Validity

The validity of the AQ-10 is primarily established through its strong criterion validity, demonstrating its effectiveness in discriminating between clinical populations diagnosed with ASD and neurotypical control groups. The 10 items included were selected specifically because they exhibited the highest discriminatory power within the original AQ-50 scale, based on rigorous statistical analysis.

Research by Allison et al. (2012) confirmed that the AQ-10 maintains a high level of accuracy, often comparable to the full AQ-50, particularly in identifying individuals above the clinical threshold. Furthermore, the instrument shows robust convergent validity with other established measures of autistic traits, confirming that it accurately measures the intended construct.

Reliability

While brief instruments like the AQ-10 often have lower internal consistency compared to their full-length counterparts, the AQ-10 generally demonstrates acceptable reliability for a screening tool. Studies have reported adequate internal consistency (measured via Cronbach’s alpha) for its intended use, which is rapid differentiation rather than detailed trait measurement.

The scale’s reliability is sufficient to ensure that the instrument provides a stable measure of the core autistic traits targeted by the scale, supporting its utility in clinical settings where speed and efficiency in case identification are paramount.

Factor Analysis

Unlike the original AQ-50, which is structured around five distinct factors, the Adult Autism Spectrum Quotient (AQ-10) is typically analyzed as a unidimensional scale. The goal of the item reduction was to create a single, highly predictive total score that could efficiently flag individuals for further assessment, rather than attempting to maintain separate subscale scores.

Factor analysis performed during the scale’s development confirmed that these 10 items load strongly onto a single underlying factor representing general autistic symptomatology. This structure justifies its use as a concise, overall measure of pervasive autistic characteristics.

Instrument

Test Type: Screening Instrument (Psychometric Scale)

Format: Self-administered Questionnaire (10 items, 4-point Likert scale)

Language Available: English (and translated versions are commonly used in international research)

Population Group: Clinical and General Adult Population

Age Group: Adults (typically 16 years and older)

Population Details: Originally validated on adults with and without a confirmed clinical diagnosis of ASD.

Test Methodology: Respondents select one of four response options (Definitely Agree, Slightly Agree, Slightly Disagree, Definitely Disagree). Scoring is binary (0 or 1 point per item), weighted based on whether the response indicates an autistic trait. A score of 7 or higher suggests the need for a specialist diagnostic referral.

Keywords

Screening, Psychometrics, Self-report, Clinical Triage, Autism Research Centre, Baron-Cohen S, Cognitive Profile.

Authors

Author ORCID Identifier: Not specified in source material.

Affiliation Email addresses: Correspondence typically directed through the Autism Research Centre (ARC).

Correspondence Address: Autism Research Centre, Department of Psychiatry, University of Cambridge, UK.

Permissions & Fee and Test Year

The AQ-10 instrument is generally available for non-commercial research and clinical use through the Autism Research Centre (ARC). Permissions for commercial use, modification, or distribution must be sought directly from the copyright holders.

Test Year: 2012

Fee: Typically free for academic and non-commercial clinical use; fees may apply for commercial applications or large-scale licensing.

The original PDF of this instrument can be downloaded here: http://docs.autismresearchcentre.com/tests/AQ10.pdf

Reference’s

• Allison C, Auyeung B, and Baron-Cohen S, (2012). Toward brief screening instruments for Autism Spectrum Disorder: The Adult Autism Spectrum Quotient (AQ-10). Journal of the American Academy of Child and Adolescent Psychiatry, 51(2):202-12.

Items of the Adult Autism Spectrum Quotient (AQ-10) – Self-administered

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

1. I often notice small sounds when others do not
2. I usually concentrate more on the whole picture, rather than the small details
3. I find it easy to do more than one thing at once
4. If there is an interruption, I can switch back to what I was doing very quickly
5. I find it easy to ‘read between the lines’ when someone is talking to me
6. I know how to tell if someone listening to me is getting bored
7. When I’m reading a story I find it difficult to work out the ch‎aracters’ intentions
8. I like to collect information about categories of things (e.g. types of car, types of bird, types of train, types of plant etc)
9. I find it easy to work out what someone is thinking or feeling just by looking at their face
10. I find it difficult to work out people’s intentions

Response Options: Definitely Agree, Slightly Agree, Slightly Disagree, Definitely Disagree.

SCORING: Only 1 point can be scored for each question. Score 1 point for Definitely or Slightly Agree on each of items 1, 7, 8, and 10. Score 1 point for Definitely or Slightly Disagree on each of items 2, 3, 4, 5, 6, and 9. If the individual scores more than 6 out of 10, consider referring them for a specialist diagnostic assessment.