Table 5.
A/Comparison of reaction times (ms) and standard deviations (SD) for 3 diagnostic groups where the required response is incongruent or congruent with the stimulus set presented.
B/Comparison of the standard deviations (sd) and coefficients of variation (cv) of the reaction times (intra-individual variance)
| “Which number?” Incongruent : 111 | Congruent : 1 | “How many?” Incongruent : 3 | Congruent : 333 | |||||
|---|---|---|---|---|---|---|---|---|
| ADHD | 1546 | 1260** | 1217 | 1364* | ||||
| SD/N | (592: 39) | (490: 39) | (534: 41) | (549: 41) | ||||
| Siblings | 1616 | 1252 # | 1510 | 1550 | ||||
| SD/N | (652: 31) | (571: 31) | (846: 32) | (709: 32) | ||||
| Controls | 1565 | 1283** | 1446 | 1344 | ||||
| SD/N | (618: 39) | (526: 39) | (703: 39) | (504: 39) | ||||
| ADHD sd | 1160 | (961) | 982 | (618) | 799 | (602) | 1065## | (736) |
| cv | .69 | (.31) | .72 | (.21) | .60 | (.22) | .71 §§ | (.24) |
| Siblings sd | 1130 | (871) | 940 | (736) | 1003 | (1164) | 1306 | (1116) |
| cv | .61 | (.21) | .67+ | (.25) | .55 | (.30) | .70 §§ | (.27) |
| Controlssd | 1196 | (1314) | 977 | (810) | 923 | (985) | 941 | (637) |
| cv | .64 | (.30) | .67 | (.30) | .55 | (.34) | .66 § | (.28) |
t-test (congruent vs. incongruent),
**
t >4.62, p <.0001:
#
t =2.66, p =.01:
*
t =−2.20, p =.03
##
t =3.14, p =.003;
§
t =2.24, p =.03;
§§
t = 3.3–4.0, p <.002; (congruent vs. incongruent)