Table 1.

Descriptive statistics for measures (N = 228).

Variable	Mean	SD	Minimum	Maximum	Skewness	Kurtosis
Age	18.48	0.55	16.76	20.44	0.52	1.76
Delay discounting (lnk)	−4.24	1.32	−8.75	−1.39	−0.46	0.32
General intelligence	24.22	5.70	6.00	36.00	−0.27	−0.09
Trait impulsivity	63.82	8.58	44.00	86.00	0.14	−0.43

Note: N = number; SD = standard deviation.