Table 1.

Summary of descriptive statistics for the IMAGEN sample

Sample information	Descriptive statistics
fMRI full sample size	n = 1,544 (53% female)
Age, y (range)	14.41 (12.56–16.04)
Affective go/no go task (n = 1,333)
Positive stimuli	12.3 (8.09)
Negative stimuli	14.0 (7.42)
SWM (n = 1,506)
Between search error	19.3 (14.0)
Delay discounting task (n = 1,518)
Small reward	0.0381 (0.0516)
Medium reward	0.0276 (0.0404)
Large reward	0.0176 (0.0342)
SDQ (n = 1,534)
Hyperactivity (parent-rated)	2.86 (2.56)
ESPAD (n = 1,495)
Lifetime alcohol consumption	17.2 (34.3)
TCI-R (n = 1,521)
Impulsiveness	26.74 (4.80)

Statistics are mean (SD) unless noted otherwise. ESPAD, European School Survey Project on Alcohol and Drugs; SDQ, Strengths and Difficulties Questionnaire; SWM, spatial working memory; TCI-R: Temperament and Character Inventory, Revised Version. Distributions of variables were shown in Fig. S7.