Suggested percentile ranks and classification for individual scores in AQ Percentile Rank Classification < 2
2 - 10
11 - 24
25 - 75
76 - 90
Conclusion This study examined the psychometric properties of a Brazilian version of the AQ
(Baron-Cohen et al., 2001) in a non-clinical population. Analyses have supported a three-
factor solution as the most consistent one, considering fit parameters, factor loadings and
Cronbach’s alpha. The three factors were interpretable accordingly to Austin`s model (2005),
factor 1 being (poor) “Social Skills”, factor 2 being (poor) “Communication / Mentalizing”
and factor 3 being “Details / Patterns”. The final version of AQ consisted of 31 items, and
presented good internal consistency and test-retest reliability.
Normality tests revealed that ASD traits as measured by AQ`s total score present
normal distribution in the Brazilian population. Distribution of the subcomponents` score was
non-normal, however. Comparison between groups showed that males scored significantly
higher than females in both AQ`s total score and the (poor) Social Skills subscale. Those
results were consistent with previous findings that men usually report more traits associated
with ASD than women (Baron-Cohen et al., 2001; Austin, 2005; Ruzich et al., 2015).
For future reference, it is suggested that individual scores in the AQ are interpreted
using norms by sex, computing Z scores for total scale and classifying subscales` scores using
percentile ranks. Further studies should assess individuals diagnosed with ASD and their
relatives, in order to verify if the instrument is sensitive to discriminate between clinical and
non-clinical population, and to detect the BAP. In theory, close relatives of individuals with
ASD should score higher than the general population in AQ.
In conclusion, the Brazilian version of the AQ was considered valid, consistent and
reliable for the Brazilian population, and therefore, an adequate instrument for future research
concerning the Broader Autism Phenotype and Autism Spectrum Disorders. With this study,
we hope to have contributed to the scientific community, especially in the domains of
Neuropsychology and Developmental Psychology.