Table 1.

Descriptive statistics of participant‐level variables (N = 231)

Variable	Mean	SD	Range	Skewness	Kurtosis
Age	18.48	0.54	16–20	0.50	1.71
Total GMV	0.67	0.59	0.53–0.82	0.12	−0.45
Grit	25.54	4.42	14–38	0.14	−0.52
Growth mindset	9.98	2.71	3–18	0.08	−0.09
General intelligence	24.18	5.68	6–36	−0.26	−0.09
Self‐control	38.14	6.62	19–56	0.26	0.12
Delayed gratification (lnk)	−4.25	1.34	−8.75 to −1.39	−0.54	0.50

Note. Abbreviations: GMV = gray matter volume; N = number; SD = standard deviation.