Table 1.

Descriptive Statistics for Demographic Variables and Bivariate Associations with Time to AUD Onset through Age 30 (n = 816)

Predictor	Descriptive Statistics: % [CI₉₅] and M (SD)				Associations with Time to AUD Onset HR [CI₉₅]
Predictor	No AUD (n = 513)	AUD (n = 303)	Test Statistic^a	p-value	Associations with Time to AUD Onset HR [CI₉₅]
Participant Characteristics
Male, % [CI₉₅]	38.1 [33.7, 42.7]	54.9 [48.9, 60.7]	20.93	<.001	1.68 [1.32, 2.15]
Non-white, % [CI₉₅]	6.6 [5.0, 8.6]	10.0 [7.3, 13.5]	3.88	.049	1.44 [1.02, 2.02]
Pubertal timing, % [CI₉₅]
Early (n = 153) vs. on-time (n = 567)	18.9 [15.4, 22.9]	22.5 [17.6, 28.2]	1.22	.270	1.24 [0.90, 1.71]
Late (n = 96) vs. on-time (n = 567)	12.3 [9.3, 16.0]	18.6 [13.9, 244]	4.16	.042	1.46 [1.03, 2.08]
Early (n = 153) vs. late (n = 96)	62.5 [53.6, 70.5]	56.0 [45.7, 65.8]	0.91	.339	0.86 [0.56, 1.29]
History of repeating grade before age 12	11.1 [8.6, 14.3]	10.3 [7.3, 14.4]	0.12	.725	0.91 [0.63, 1.33]
Family Demographic Variables
Dual versus single parent household, % [CI₉₅]	58.7 [54.2, 63.1]	55.1 [49.1, 60.9]	0.92	.336	0.86 [0.68, 1.10]
At least one parent completed college, % [CI₉₅]	44.1 [39.6, 48.7]	44.3 [38.4, 50.3]	0.01	.968	1.01 [0.79, 1.29]
Mean parent age at T₁, M (SD)	42.4 (6.0)	42.1 (5.9)	0.71	.476	0.99 [0.97, 1.01]
Number of older siblings, M (SD)	0.9 (1.1)	0.9 (1.1)	0.70	.484	0.97 [0.87, 1.08]

Note. HR = hazard ratio; CI₉₅ = 95% confidence interval. Bolded table entries denote statistically significant effects.

Likelihood ratio chi-square and independent observation t-tests were conducted on categorical and continuous variables, respectively.