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Table 2 Correlations between the individual task variables and the endophenotypic construct

From: Relationship between endophenotype and phenotype in ADHD

   first-borns second-borns
Task Measure z-scores raw data z-scores raw data
Stop task Stop signal reaction time .66 .63 .67 .64
Shifting attentional set % errors .63 .67 .67 .71
Time reproduction Absolute deviation .70 .59 .74 .67
Visuo-spatial sequencing N identified targets correct order .73 .72 .79 .80
Digit span N backwards .55 .53 .69 .69
Pursuit Precision .74 .64 .77 .65
Tracking Precision .60 .55 .54 .48
Tapping Variability .46 .50 .49 .47
Baseline speed Variability .52 .48 .70 .62
Motor timing Variability .71 .56 .73 .52