At endpoint , statistically significantly greater mean reductions were seen in the atomoxetine versus placebo group for the BRIEF-A Global Executive Composite ( GEC ) , Behavioral Regulation Index ( BRI ) , and Metacognitive Index ( MI ) scores , as well as the Inhibit , Self-Monitor , Working Memory , Plan/Organize and Task Monitor subscale scores ( p < .05 ) , with decreases in scores signifying improvements in executive functioning .