Figure 2.

Top: scatter plot representing female subjects from all sites, their DX status, age, combined IQ (average of the two available measures), and handedness. The x-axis corresponds to the subject age. Along the y-axis, typically developing control subjects are plotted below the y = 0 line, and ADHD subjects above (i.e., |IQ| = IQ, with negative values simply denoting TDC subjects). The position along the y-axis corresponds to the average IQ measure, with subjects whose records did not include IQ plotted around y = − 25 and 25. The marker for each subject corresponds to diagnosis status (dot is control, o is ADHD-combined type, × is ADHD-hyperactive/impulsive, and + is ADHD-inattentive), and its color to handedness (red is left-handed). Coordinates are jittered slightly to improve visualization. Bottom: same as the plot above, but for male subjects.