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. Author manuscript; available in PMC: 2013 Nov 1.
Published in final edited form as: J Child Psychol Psychiatry. 2012 Aug 6;53(11):1139–1148. doi: 10.1111/j.1469-7610.2012.02596.x

Tab. 2.

Effects of neuropsychological functions on ADHD symptoms, controlling for age, gender, and IQ (A) and for age, gender, IQ, and EL symptoms score (B)

A B
N SRC (SE) t p SRC (SE) t p
MRT1 512 0.48 (0.06) 8.54 *** 0.21 (0.04) 5.24 ***
RTV1 512 0.47 (0.05) 10.04 *** 0.24 (0.03) 7.42 ***
Omission errors %2 813 0.39 (0.03) 11.33 *** 0.18 (0.02) 7.38 ***
Commission errors %2 813 0.34 (0.06) 6.11 *** 0.19 (0.04) 5.09 ***
Digit span backwards 854 −0.26 (0.07) −3.92 *** −0.14 (0.04) −3.16 **
Choice impulsivity %3 886 0.15 (0.05) 3.25 ** 0.06 (0.03) 2.12 *
Immediate drive for impulsive reward4 879 0.20 (0.05) 3.70 *** 0.08 (0.03) 2,27 *
Delay aversion5 867 0.04 (0.05) 0.82 ns 0.01 (0.03) 0.34 ns
MRT (event rate effect; ms)6 813 −0.19 (0.03) −5.51 *** −0.08 (0.02) −3.57 ***
RTV (event rate effect; ms)6 813 −0.19 (0.04) −5.29 *** −0.08 (0.02) −3.23 **
MRT (incentive effect; ms)7 526 −0.13 (0.05) −2.92 ** −0.04 (0.03) −1.31 ns
RTV (incentive effect; ms)7 526 −0.19 (0.05) −3.76 *** −0.07 (0.03) −2.18 *
MRT (event rate + incentive effect; ms)8 614 −0.28 (0.04) −6.86 *** −0.15 (0.03) −5.44 ***
RTV (event rate + incentive effect; ms)8 614 −0.26 (0.04) −6.78 *** −0.16 (0.03) −6.28 ***

Abbreviations: EL, emotional lability; MRT, mean reaction time; RTV, reaction time variability

1

Mean score (Go/No-go task, slow condition & Fast task, baseline condition);

2

Mean score of error percentage in the Go/no-go task, slow condition & fast condition;

3

Percentage of impulsive choices (MIDA task, no-postdelay condition)

4

Percentage of impulsive choices (MIDA task, postdelay condition)

5

Difference of percentages of impulsive choices in no-postdelay condition vs. post delay condition (MIDA task)

6

Go/No-go task; fast -slow condition difference

7

Go/No-go task; incentive -slow condition difference

8

Fast task; incentive/fast -baseline condition difference

*

p ≤ 0.05,

**

p ≤ 0.01,

***

p≤0.001

The covariates age, gender and IQ explained 5.4% of EL variance (estimated from a subsample of uncorrelated observations, i. e. no sibling pairs)