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Table 4 Association between fast task variables and parent and teacher ratings on the Conners' scales (T-scores): correlations (r) and partial correlations, controlling for age (partial r), with associated effect sizes (d)

From: Testing assumptions for endophenotype studies in ADHD: Reliability and validity of tasks in a general population sample

Measure Teacher (n = 36): total ADHD symptom score Parent (n = 43): total ADHD symptom score
  r d partial r d r d partial r d
baseline (all trials)
   mean RT .19 0.4 .42** 0.9 -.06 -0.1 .13 0.3
   SD of RTs .45** 1.0 .58** 1.4 .16 0.3 .29 0.6
baseline (30 trials)
   mean RT .14 0.3 .35* 0.7 -.11 -0.2 .06 0.1
   SD of RTs .44** 1.0 .55** 1.3 .17 0.4 .28 0.6
fast-incentive
   mean RT -.03 -0.1 .10 0.2 -.08 -0.2 .10 0.2
   SD of RTs .09 0.2 .22 0.5 .08 0.2 .26 0.5
difference score (baseline 30 trials – fast-incentive)
   mean RT .20 0.4 .24 0.5 .07 0.1 -.03 0.0
   SD of RTs .47** 1.1 .47** 1.1 .14 0.3 .14 0.3
  1. * p < .05 (2-tailed); ** p < .01 (2-tailed)