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. Author manuscript; available in PMC: 2011 Apr 1.
Published in final edited form as: Biol Psychiatry. 2010 Jan 12;67(7):632–640. doi: 10.1016/j.biopsych.2009.10.036

Table 2.

Group differences in behavioral performance on Stroop and WM tasks

GROUP
Control ADHD T-test
STROOP M (SD) M (SD) T
Accuracy
 Interference score 0.089 (0.054) 0.086 (0.092) .165
 Facilitation score -0.010 (0.035) 0.000 (0.040) -.805
 congruent 0.960 (0.034) 0.954 (0.031) .601
 incongruent 0.883 (0.063) 0.877 (0.096) .243
 neutral 0.969 (0.034) 0.956 (0.040) 1.134
 NC 0.969 (0.033) 0.954 (0.038) 1.414
 NI 0.973 (0.036) 0.963 (0.035) .893
 NN 0.970 (0.028) 0.961 (0.026) 1.106
Reaction Time
 Interference score 0.223 (0.116) 0.146 (0.097) 2.343*
 Facilitation score -0.040 (0.059) 0.015 (0.061) -2.974*
 congruent 711 (76) 697 (90) .525
 incongruent 856 (93) 825 (98) 1.082
 neutral 698 (58) 739 (92) -1.751
 NC 683 (62) 708 (77) -1.142
 NI 702 (72) 723 (97) -0.813
 NN 679 (63) 709 (87) -1.317
WORKING MEMORY
WAIS
 Forward Digit Span 11.91 (2.29) 10.10 (1.02) 3.260*
 Backward Digit Span 8.04 (2.55) 6.65 (1.53) 2.131*
Spatial Span
 Forward Spatial Span 10.48 (1.78) 8.90 (1.64) 3.313*
 Backward Spatial Span 8.87 (1.96) 7.80 (1.64) 1.922+
*

= p<.05

+

= p < .10