Anne Fleur Kortekaas-Rijlaarsdam

CHAPTER 3 68 Table 3.2 Effects of Methylphenidate on ADHD Symptoms and Academic Performance and Comparisons with TD-Group ADHD TD PLA MPH PLA v MPH PLA v TD MPH v TD M SD M SD M SD t d t d t d ADHD symptoms 1 Parent report -21.98 11.99 -7.87 17.04 Not available 5.90** .96 Not Available Teacher report -19.57 16.84 -9.20 16.80 Not available 4.74** .62 Not Available Math SAT productivity 40.00 10.87 41.95 10.03 48.49 14.46 3.88** .19 3.77** .66 3.00** .52 SAT accuracy 93.77 5.72 93.80 5.99 95.62 4.67 0.03 .00 2.02* .36 WP productivity 64.21 24.41 65.98 21.26 65.88 24.70 0.05 .08 .38 WP accuracy 45.20 30.34 54.20 27.06 57.23 27.28 2.83** .31 2.33* .42 .62 .11 Reading OMR productivity 51.18 13.40 50.92 13.43 54.43 14.78 -0.05 -.02 1.30 Spelling PI-dictation level 2 666.45 322.99 674.15 330.82 743.30 341.25 1.39 .02 1.31 Note. ADHD Attention-deficit hyperactivity disorder; TD Typically developing controls; PLA placebo; MPH methylphenidate; SAT Speeded arithmetic test; WP Mathematical word problems; OMR One minute reading test; Accuracy = items correct / items completed x 100%; Productivity = items completed / items available x 100%; 1 total score, ranging from-54 to +54 with negative values indicating ADHD symptoms; 3 level between 1-9 multiplied by number correct; * p < .05 ** p < .01.