Table 1. Baseline and follow-up demographic characteristics.

		Controls (n = 20) M (SD)	Heavy Drinkers (n = 20) M (SD)
Baseline	Age (range 11.7 to 16.7)	14.1 (1.2)	14.7 (1.1)
	% female	45%	45%
	Hollingshead SESa	26.2 (18.0)	24.1 (17.9)
	Family history density	0.8 (0.8)	0.8 (0.8)
	Achenbach Externalizing T-score	39.8 (6.6)	43.1 (8.3)
	Achenbach Internalizing T-score	38.5 (9.3)	42.3 (10.7)
	Reading standard score	110.1 (13.0)	113.0 (6.2)
	Vocabulary T-score	53.7 (11.8)	58.3 (6.5)
	Pubertal stage	2.6 (0.6)	2.9 (0.6)
	Body mass index	21.0 (5.2)	20.2 (2.8)
	Inhibitions percent correct (%)	77.4 (1.1)	83.3 (1.1)
	D-prime (D′)	3.1 (0.6)	3.1 (0.5)
	Response bias (β)	0.2 (0.2)	0.2 (0.1)
Follow-up	Age (range 14.7 to 20.6)	17.6 (1.2)	18.5 (1.8)
	Years between baseline and follow-up	3.4 (0.8)	3.3 (1.2)
	Achenbach Externalizing T-score	37.6 (3.9)	41.6 (13.0)
	Achenbach Internalizing T-score	34.8 (7.2)	38.9 (11.4)
	Past year drinking days per month***	0.0 (0.1)	2.8 (1.8)
	Past year average drinks/episode***	0.2 (0.4)	4.2 (2.1)
	Past year bingeb episodes***	0.0 (0.0)	9.0 (13.8)
	Past year peak drinks/episode***	0.0 (0.0)	10.5 (11.3)
	Lifetime number of drinks***	0.5 (0.9)	92.3 (94.5)
	Lifetime number of cigarettes***	0.0 (0.0)	0.5 (0.2)
	Lifetime cannabis use episodes*	0.3 (1.1)	4.8 (9.1)
	Lifetime other drug use episodes***	0.0 (0.0)	0.2 (0.5)
	Days since last alcohol binge episodec	N/A	70
	Days since last cannabis usec	138	116
	Days since last other drug usec	N/A	131
	Inhibitions percent correct (%)	86.4 (1.0)	90.6 (0.7)
	D-prime (D′)	3.3 (1.0)	3.8 (0.5)
	Response bias (β)	0.2 (0.1)	0.3 (0.1)

^*p < 0.05

^**p < 0.01

^***p < 0.001

^aHollingshead SES scores typically range from 11-77, with lower scores indicating higher SES.

^bBinge episode = 4+ drinks for females or 5+ drinks for males.

^cOf those individuals who reported alcohol, cannabis, and/or other drug use, average number of days between date of last use and scan date.