Means (with SE bars) for GEC, Index, and Clinical Scale T- Scores for DS group. 1 = Global Executive Composite, 2 = Inhibitory Self-Control Index, 3 = Flexibility Index, 4 = Emergent Metacognition Index, 5 = Inhibition Scale, 6 = Shift Scale, 7 = Emotional Control Scale, 8 = Working Memory Scale, 9 = Plan/ Organize Scale; * = scores for which the group mean significantly exceeded the normative mean T score of 50 (higher scores are associated with greater impairment); Bonferroni-adjusted p < .05.