Brief Report: The Social Responsiveness Scale for Adults (SRS-A): Initial Results in a German Cohort

The Social Responsiveness Scale (SRS; Constantino et al. 2003) is a quantitative measure of autistic traits in 4–18 year olds. The SRS has demonstrated good psychometric properties and cross-cultural validity for Autism Spectrum Disorder (ASD) assessment (Bölte et al. 2008, 2011). A revised form extended the application of the SRS with items modified to address social responsiveness in adulthood (SRS-A; Constantino and Todd 2005). Like the child version, the SRS-A contains 65 Likert-scaled (0–3) items, generates a singular scale with a maximum score of 195 for behavior shown in the last 6 months, and takes 15–20 min to complete. Possible administrations are self-, parent-, other relative-, and spouse-report. Yet, only sparse information has been published on this instrument (Virkud et al. 2009). The present study, using a German adaptation, provides a range of new results on the SRS-A.

Three samples were collected: First, parent reports at a specialized autism center on N = 20 (5 females, 15 males) individuals with high functioning ASD aged 18–36 years with a mean age of 27.5 years (SD = 6.5), and a mean full scale IQ on the Wechsler Intelligence Scales for Adults of 112.8 (SD = 16.4). Single clinical diagnoses of 10 Asperger’s syndrome, 5 autism, and 5 atypical/PDD-NOS were based on ICD-10 research criteria, corroborated by findings from the Autism Diagnostic Interview-Revised and Autism Diagnostic Observation Schedule (ADOS). Second, spouse-report on a mixed adult psychiatric sample (non-ASD) (CLIN) of N = 62 individuals (28 females, 34 males) aged 28–56 years (M = 40.0, SD = 6.6). Third, SRS-A data on N = 163 (89 females, 74 males) typically developing adults (TD) aged 19–79 years with reporting sources varied among spouses, siblings, and others.

Raw scores/discriminant validity. The SRS-A mean total score was highest in the ASD sample (M = 78.5, SD = 13.7), intermediate in the CLIN (M = 63.4, SD = 15.4), and lowest in the TD (M = 55.5, SD = 9.9) (F _2/244 = 36.8, p < .0001, partial eta ² = .24, 1 − β observed = 1.00). Receiver operating characteristics (ROC) analyses in 20 ASD versus 245 CLIN plus TD cases showed an area under the curve of AUC = .88 (p < .001) (Fig. 1), with a SRS-A total score of 67 showing a balance of sensitivity (.85) and a specificity (.83) for ASD. Internal consistency. Cronbach’s alpha was .89 in the ASD, .84 in CLIN, and .71 in the TD. Concurrent validity. Availability of other measures was limited to the ASD group. Within this group, correlations of the SRS-A total score were: r(Pearson) = .83 (p < .001) with the Social Communication Questionnaire (SCQ) total score (lifetime version), r = .25 (p = .09) with the ADOS module 4 social-communication algorithm subscale score, and r = .35 (p = .04) the Autism Spectrum Quotient (AQ) total score.

The findings reported here provide adequate preliminary support for the application of the SRS-A for the assessment of autism traits in adults. These findings parallel those seen in the extensive literature on the standard child SRS. It may be noted that the actual spread between TD and ASD on the SRS-A total score (55.5 vs. 78.5) is not as wide as has been found for the standard SRS (e.g. ~24 vs. ~102; Bölte et al. 2008, in German samples). The latter might be partially explained by the fact that the ASD group included mostly high functioning adults showing less extreme phenotypic expression of autistic symptoms than would be typical for the spectrum as a whole. In addition, rater type (mother, father, spouse, sibling, others) might be crucial for SRS-A information, and was not comparable between samples in this study. Thus, it is clear that replication and extension into more widely varied and larger samples is required to further endorse the utility of the SRS-A. Furthermore, replication is needed for the original SRS-A, and other adaptations, as the present results might be specific to a German sample and translation.