In some cases, group status may have been designated because of a fairly small shift upwards or downwards from the cutoff. The percentages of IMs who gained 10 or more points (and mean change) from T1 to T3 were 81% (M = 14.68) and 66% (M = 12.37) for mothers’ reports of externalizing and internalizing and 53% (M = 10.77) and 71% (14.95) for teachers’ reports of externalizing and internalizing, respectively. Analogous percentages and means for Ds were 55% (M = −10.18), 62% (M = −11.33), 57% (M = −13.22), and 71% (M = −15.55). Thus, on average, the degree of change was substantial.
