Table 4.

Logistic regression analyses odd ratios (with 95% confidence intervals [in brackets]) using baseline (Time 1) items significantly different across trajectories of maximum drinks classes in Table 3 to predict each of Class 1 through 4

Baseline (Time 1) predictors	Class 1 Consistent low	Class 2 Low to high	Class 3 High to low	Class 4 Consistent high
Demography
Sex, female, %	3.60 [2.47, 5.31]	0.37 [0.23, 0.59]	0.59 [0.35, 0.97]	0.22 [0.08, 0.64]
Age		0.63 [0.51,0.78]	1.67 [1.73, 2.26]
Alcohol
Age onset drinking	1.32 [1.08, 1.60]
First 5 SRE [LR]	0.45 [0.37, 0.55]	1.70 [1.38, 2.11]		3.01 [2.07,4.38]
Flush score no.				0.57 [0.36, 0.91]
AUD, %	0.40 [0.27, 0.60]		2.68 [1.62, 4.46]	6.97 [2.98, 16.26]
Drugs
Used tobacco > 100 times %	0.56 [0.38, 0.83]	1.64 [1.04, 2.58]		3.25 [1.44, 7.34]
Externalizing
No. of conduct disorder symptoms				1.45 [1.02,2.06]
Barrett impulsivity	0.80 [0.64, 0.98]			1.64 [1.08, 2.42]
NEO extraversion	0.81 [0.67, 0.99]		1.56 [1.18, 2.08]
NEO conscientiousness			0.75 [0.57, 0.99]
NEO openness	1.25 [1.02, 1.52]
Internalizing
NEO neuroticism	0.80 [0.65, 0.98]	1.55 [1.23, 1.95]		0.64 [0.44, 0.94]
Environment/attitudes
Peer maximum drinks		0.64 [0.51, 0.81]	1.33 [1.02, 1.73]
z alcohol expectancy			1.37 [1.03, 1.83]
Drink to cope	0.40 [0.27, 0.60]	1.42 [1.14, 1.77]
Pseudo R2	.45	.23	.20	.51

Notes: Blank cells = nonsignificant; continuous variables were entered as standardized variables. SRE = self-report measure of the number of drinks need for effects the first five times drinking; LR = level of response; no. = number; AUD = alcohol use disorder; NEO = NEO Five-Factor Inventory personality inventory with scores presented as T values where 50 indicates an average score regarding the literature; peer maximum drinks = from Important Persons and Activity Scale; alcohol expectancy = Alcohol Expectancy Questionnaire (adult and adolescent); z alcohol expectancy = scales z scored within adults and within adolescents.