Review: Social Responsiveness Scale, Second Edition (SRS-2)
The second edition of the
widely administered Social
Responsiveness Scale (SRS-2; Constantino & Gruber, 2012) maintains continuity with the
original instrument as an efficient quantitative measure of the various
dimensions of interpersonal behavior, communication, and repetitive/stereotypic
behavior associated with autism spectrum disorder (ASD). The SRS-2 extends
the age range from 2.5 years through adulthood. There are now four forms, each
consisting of 65 items and for a specific age group: Preschool Form (ages 2.5
to 4.5 years); School-Age Form (4 to 18 years); Adult Form (ages 19 and up);
and Adult Self-Report Form (ages 19 and up). Nationally representative standardization
samples were collected to support each form. These samples consist of a total
of 4,709 ratings of 1,963 individuals: 474 ratings of 247 preschool children,
2,025 ratings of 1,014 school-age children, and 2,210 ratings of 702 adults.
Content
The individual items of
the SRS-2 show strong parallels across forms. While most of the 65 items are
the same, some were changed and reference activities and social behavior that
are specific and appropriate to the ages covered by their respective form. Only
the School-Age form is unchanged in its item content from the first edition of
the SRS. Each item is scored on a 4 point Likert-scale: 1 (“not true”); 2
(“sometimes true); 3 (often true); and 4 (“almost always true”). Scores are
obtained for five Treatment Subscales: Social Awareness; Social Cognition;
Social Communication; Social Motivation; and Restricted Interests and
Repetitive Behavior. There are also two DSM-5 Compatible Subscales (Social
Communication and Interaction and Restricted Interests and Repetitive Behavior)
that allow comparison of symptoms to the new DSM-5 ASD diagnostic
criteria.
Interpretation
Interpretation is based on
a single score (Total Score) reflecting the sum of responses to all 65 SRS
questions which serves as an index of severity of social skills across the
autism spectrum. The SRS-2 Total score is expressed in raw and T-scores. Raw
scores are converted to T-scores for gender and respondent. T-score guidelines
provide interpretive language applicable to the specific age rages covered by
the various forms (preschool, school-age, and adult). A total T-score of 76 or
higher is considered severe and strongly associated with clinical diagnosis of
Autistic Disorder. T-scores of 66 through 75 are interpreted as indicating Moderate
deficiencies in reciprocal social behavior that are clinically significant and
lead to substantial interference in everyday social interactions, whereas T-scores
of 60 to 65 are in the Mild range and indicate mild to moderate deficits in
social interaction. T scores of 59 and below are considered to be within
typical limits and generally not associated with clinically significant ASD. A
Profile Sheet for each form provides T-score results and a brief summary
statement to facilitate interpretation and discussion of results. Raters can
complete the 65 items in approximately 15 to 20 minutes. Scoring and graphing
can be completed in approximately 5 to 10 minutes. The manual provides a series
of case examples to illustrate application of the SRS-2 at different points
across the lifespan (preschool, school-age, and adult). Although the SRS-2 is
relatively easy to administer and score, interpretation and application of the
results require professional training and experience in child development,
psychology, or education.
Psychometric
Characteristics
More than 40 research
studies and independent resources support the diagnostic validity of SRS-2 and
the instrument’s application in a wide variety of clinical and educational
contexts. Based on research analyses, a total raw score cutpoint value of 70 is
associated with a sensitivity value of .78 and specificity value of .94 for any
ASD (autistic disorder, Asperger's disorder, or PDD-NOS) in unselected
general-population groups. In terms of positive predictive value (PPV), 93% of
children whose scores fall above this cutpoint will, upon completion of a
comprehensive assessment, receive a diagnosis of ASD. In most clinical and
school settings, raw scores at or above 85 from two separate informants provide
very strong evidence of ASD. In a large clinical sample (School-Age Form), ROC
(receiver operating characteristics) analyses indicate an area under the curve
(AUC) of .968 and a sensitivity and specificity value of .92 at a raw score of
62. This suggests that the SRS-2 is a robust instrument for discriminating
between individuals with ASD and those unaffected by the condition. Large
samples also provide evidence of good interrater reliability, high internal
consistency, and convergent validity with the Autism Diagnostic
Interview-Revised (ADI-R), Autism Diagnostic Observation Schedule (ADOS), and
Social Communication Questionnaire (SCQ).
Conclusion
A significant strength of
the SRS-2 is its facility in quantitatively measuring autistic traits and
symptoms across the complete range of severity (mild to severe). This is
especially important when identifying the more subtle characteristics of autism
and more capable and less severely affected individuals with ASD (without
intellectual disability). The SRS-2 forms should also be useful for quantifying
response to intervention/treatment over time. Extending the age range of the
SRS-2 adds to its versatility as a screening and diagnostic measure of symptoms
associated with ASD. The Preschool and Adult Forms afford multiple perspectives
throughout the life span and provide important tools for both clinicians and
researchers to assess these populations. The subscales corresponding to the two
symptom domains: Social Communication (SCI) and Restricted Interests and
Repetitive Behavior (RRB) also align the SRS-2 with the DSM-5 criteria for Autism Spectrum Disorder (ASD) and Social (Pragmatic) Communication Disorder (SCD).
Because a majority of independent research has been limited to the School-Age
form, studies are needed to provide further information relative to the
diagnostic validity of the Preschool and Adult Forms. Likewise, research is
needed to examine the relationship between social impairment and intellectual
disability and the more severe forms of ADHD. In sum, the SRS-2 can be used
confidently in school and clinical contexts as an efficient measure of ASD
symptomatology and severity. Consistent with best practice, the results of questionnaire measures must be integrated with information
from multiple sources and interpreted within the context of a
comprehensive developmental assessment (see Wilkinson for a description of assessment domains and recommended measures).
Constantino, J. N.,
& Gruber, C. P. (2012). Social
Responsiveness Scale, Second Edition. Los Angeles, CA: Western
Psychological Services.
Adapted from: Wilkinson, L. A. (2017). A Best Practice Guide to Assessment and Intervention for Autism Spectrum Disorder in Schools (2nd Edition). London & Philadelphia: Jessica Kingsley Publishers.
Lee A. Wilkinson, PhD, is a licensed and nationally certified school psychologist, and certified cognitive-behavioral therapist. He is author of the award-winning books, A Best Practice Guide to Assessment and Intervention for Autism and Asperger Syndrome in Schools and Overcoming Anxiety and Depression on the Autism Spectrum: A Self-Help Guide Using CBT. He is also editor of a text in the APA School Psychology Book Series, Autism Spectrum Disorder in Children and Adolescents: Evidence-Based Assessment and Intervention in Schools. His latest book is A Best Practice Guide to Assessment and Intervention for Autism Spectrum Disorder in Schools (2nd Edition).