Table 1 Summary of demographic and behavioural measurements

From: The myeloarchitecture of impulsivity: premature responding in youth is associated with decreased myelination of ventral putamen

Variables Age [years] Gender [female proportion] EP PR k CE
(1) Descriptive statistics
Mean 21.69 0.30 2.51 14.71 0.009 0.49
Std. 2.69 - 1.29 12.64 0.017 0.17
Skewness 2.69 - 0.16 12.64 0.01 0.17
Kurtosis 2.11 - 1.65 4.13 27.18 2.66
(2) Pearson’s correlation (p-value)
Age   − 0.16 (0.12) 0.04 (0.67) 0.02 (0.81) − 0.12 (0.23) − 0.20 (0.05)
Gender    − 0.24 (0.02) 0.22 (0.31) − 0.05 (0.65) 0.16 (0.13)
EP     0.08 (0.41) − 0.18 (0.08) − 0.17 (0.08)
PR      0.04 (0.71) 0.18 (0.07)
k       0.03 (0.73)
(3) Multicollinearity diagnosis scores
VIF 1.1 1.2 1.1 1.1 1.0 1.1
  1. CE commission error rate on the Go/NoGo task, EP externalizing problems, k overall delay discount, PR premature response score, VIF variance inflation factor