Table 1

Multivariate comparisons for the six tasks of the Maudsley Attention and Response Suppression task battery by group

Task Measure Community controls (n=23) Psychiatric controls (n=16) ADHD (n=16) ANOVA F (d.f.) P Between groups
Mean (s.d.) Mean (s.d.) Mean (s.d.)
ADHD, attention-deficit hyperactivity disorder; ANOVA, analysis of variance; C, community controls; MRT, mean reaction time; MST, mean synchronisation time; P, psychiatric controls; Pi, probability of inhibition; SD, intrasubject standard deviation; SSRT, stop signal reaction time.
Go/no go MRT (ms) 383 (65) 363 (48) 365 (98) 0.47 (2.52) 0.62
SD 109 (26) 129 (33) 145 (33) 4.31 (2.52) 0.02 ADHD>C
Omission errors 4 (3) 7 (6) 10 (8) 4.25 (2.52) 0.02 ADHD>C
Pi(%) 77 (11) 70 (20) 60 (20) 3.64 (2.52) 0.03 ADHD>C
Stop MRT (ms) 611 (93) 541 (166) 590 (109) 1.58 (2.52) 0.22
SD 90 (47) 184 (68) 205 (47) 0.63 (2.52) 0.54
Omission errors 3.9 (4.7) 4.1 (3) 5.3 (7.6) 0.35 (2.52) 0.71
Prepotent responses 0.7 (1.2) 2.1 (4) 3.4 (3.5) 3.63 (2.52) 0.03 ADHD>C
Pi(%)
overall 79 (11) 71 (16) 67 (18) 3.40 (2.52) 0.04 ADHD>C
150 ms 88 (11) 82 (17) 76 (21) 2.64 (2.52) 0.08
250 ms 75 (12) 65 (16) 63 (20) 3.23 (2.52) 0.04 ADHD>C
SSRT (ms) 229 (38) 224 (49) 271 (113) 2.27 (2.52) 0.11
Reversal MRT (ms) 383 (67) 361 (56) 364 (82) 0.59 (2.52) 0.56
SD 113 (34) 116 (41) 139 (62) 1.74 (2.52) 0.19
Omission errors 2 (3) 2 (2) 5 (5) 2.89 (2.52) 0.07 ADHD>C;ADHD>P
Pi(%) 79 (13) 69 (22) 65 (20) 3.33 (2.52) 0.04 ADHD>C
Stop of tapping MST (ms) 149 (11) 142 (23) 152 (19) 0.45 (2.46) 0.64
SD 85 (4) 82 (10) 87 (7) 0.41 (2.46) 0.65
Omission errors 35 (7) 34 (4) 41 (15) 2.1 (2.46) 0.12
Commission errors 35 (5) 37 (10) 38 (11) 0.9 (2.46) 0.40
Tapping MST (ms) 164 (95) 158 (96) 165 (105) 0.5 (2.45) 0.60
SD 95 (41) 96 (13) 105 (45) 0.44 (2.45) 0.64
Omission errors 12 (7) 14 (8) 11 (8) 0.18 (2.45) 0.84
Delay MST (ms) 384 (120) 376 (152) 435 (213) 0.65 (2.52) 0.53
SD 244 (163) 254 (152) 318 (211) 0.90 (2.52) 0.41