The measure of coronal skew was correlated with the AQ for prefrontal width (r = −0.19) and also showed a trend toward a low correlation with the cingulate sulcus trait, although this result did not meet standard thresholds for statistical significance after correcting for multiple tests. 3 Variance Component Analysis of Genetic and Environmental Influences Prior to estimating the genetic contributions to the AQs, we implemented variance component analysis to estimate the proportion of variance due to genetic (heritability estimate) and environmental influences on cerebral volume and width measurements from the left and right hemispheres (upper portion of Table 5 ).
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