Table 1.

Study sample composition and assessment time point

	Year 1 fall	Year 1 spring	Year 2 spring	Year 3 spring	Year 4 spring
Variable	n = 1,676	n = 1,495	n = 1,055	n = 570	n = 290
Female	59.9%	62.6%	62.9%	63.5%	62.4%
Age, in years	18.49 (0.33)	19.00 (0.35)	19.96 (0.34)	20.95 (0.34)	21.98 (0.34)
Grams of ethanol/montha	300.66 (524.62)	300.13 (557.50)	327.47 (534.63)	388.93 (657.21)	399.63 (574.75)
PRS	0.44 (2.34)	0.41 (2.39)	0.45 (2.33)	0.44 (2.33)	0.22 (2.37)

Notes: Statistics are percentage or mean (standard deviation). PRS = polygenic risk score.

^aGrams of ethanol/month is reported here untransformed for easier interpretation.