The neurocognitive phenotypes included performance on the Computerized Neurocognitive Battery (CNB)67, as well as results from the Wide Range Achievement Test (WRAT-4). Ak−x transformation (where k is a constant) was performed on CNB measures of age differentiation, emotion differentiation, spatial memory, and verbal reasoning, as their distributions were left-skewed. A log10(k - x) transformation was performed on CNB measures of abstraction and mental flexibility, attention, verbal memory, and working memory, as their distributions were left-skewed. A log10(x) transformation was performed on the WRAT-4 measure while a 1/x transformation was performed on the CNB measure of sensorimotor processing, as their distributions were right-skewed. For the CNB measure of emotion identification, a k−x transformation was performed on the PEIT-AB form of the task and a log10(k−x) transformation was performed on the PEIT-C, PEIT-D, and PEIT-E forms of the task, each due to their left-skew. For the CNB measure of nonverbal reasoning, a k−x transformation was performed on the PMAT-18B form of the task due to its left-skew, while a x transformation was performed on the PMAT-24A form of the task due to
