Table 3.

Fixed effect estimates and significance tests of linear models for drinks per week, drinking frequency, typical drinks, peak drinks, and alcohol-related problems

Variable	Drinks per week	Drinking frequency	Typical drinks	Peak drinks	Alcohol problems
	β(SE)	β(SE)	β(SE)	β(SE)	β(SE)
Estimates of intervention effects at the 4-week post-test assessment (n = 225)
Intercepts	19.53 (1.77)**	3.58 (0.30)**	4.86 (0.36)**	6.45 (0.39)**	14.55 (1.94)**
Gender (0 = Male, 1 = Female)	−4.16 (1.14)**	−0.22 (0.19)	−0.58 (0.23)**	−1.11 (0.25)**	−2.61 (1.25)*
Control slope	−2.32 (1.09)*	−0.33 (0.19)†	−0.39 (0.28)	−0.32 (0.08)**	−4.72 (1.21)**
BASICS intercept	−0.09 (1.50)	−0.25 (0.25)	0.08 (0.31)	0.10 (0.35)	−3.11 (1.64)†
Referral group intercept (0 = mandated, 1 = volunteer)	−0.28 (1.35)	0.13 (0.23)	0.15 (0.27)	−0.01 (0.29)	0.70 (1.48)
Intervention slope	−5.14 (1.32)**	−0.27 (0.22)	−1.08 (0.34)**	−1.94 (0.38)**	−2.56 (1.47)†
Estimates of intervention effects at the 12-month follow-up assessment (n = 169)
Intercepts	17.44 (1.24)**	3.59 (0.24)**	4.86 (0.26)**	6.34 (0.30)**	12.91(1.39)**
Gender (0 = Male, 1 = Female)	−3.17 (0.90)**	−0.37 (0.18)*	−0.55 (0.19)**	−0.82 (0.22)**	−0.84 (0.91)
Control slope	−0.86 (0.37)*	−0.13 (0.65)*	−0.27 (0.07)**	−0.32 (0.08)**	−0.88 (0.43)*
Intervention intercepts
Model A
BASICS	−6.11 (1.30)**	−0.70 (0.26)**	−1.51 (0.28)**	−2.05 (0.33)**	−6.92 (1.55)**
Model B
BASICS, volunteer	−6.39 (1.44)**	−0.75 (0.28)**	−1.59 (0.30)**	−2.16 (0.35)**	−6.30 (1.62)**
BASICS, mandated	−7.03 (1.09)**	−0.86 (0.22)**	−1.75 (0.23)**	−2.40 (0.26)**	−4.87 (1.10)*
Intervention slope	0.76 (0.44)†	0.09 (0.08)	0.27 (0.08)**	0.29 (0.22)**	1.35 (0.52)**

Note.

^**p < .01.

^*p < .05.

^†p < .10.

BASICS = Brief Alcohol Screening and Intervention for College Students. Model A refers to the model in which both BASICS groups were combined and entered as a single BASICS condition. Model B refers to the model in which the mandated BASICS and volunteer BASICS groups were entered as separate factors.