Table 2.

Study outcomes over 12-month follow-up^a

Variable	Baseline	3 months	6 months	9 months	12 months	Trend p b
Drinking behaviors
Typical BAC	(.47)	(.003)	(.002)	(.603)	(.937)	.018
Intervention	.076 [.003]	057 [.004]	.057 [.004]	.059 [.005]	060 [.004]
Control	.080 [.004]	.071 [.004]	.073 [.005]	.062 [.004]	.060 [.004]
Peak BAC	(.21)	(.003)	(<0.001)	(.309)	(.646)	.006
Intervention	.144 [.006]	.112 [.007]	.108 [.007]	.110 [.008]	.113 [.007]
Control	.158 [.006]	.142 [.007]	.145 [.008]	.122 [.007]	.118 [.007]
Average no. drinks/sitting	(.40)	(.147)	(.027)	(.928)	(.757)	.064
Intervention	4.69 [0.168]	4.029 [0.239]	3.818 [0.244]	3.982 [0.289]	3.969 [0.224]
Control	4.90 [0.176]	4.497 [0.228]	4.559 [0.254]	4.009 [0.214]	4.043 [0.224]
No. days met 5/4 HED in month	(.46)	(.322)	(.031)	(.534)	(.942)	.102
Intervention	5.04 [0.339]	4.55 [0.464]	3.92 [0.399]	3.94 [0.414]	4.34 [0.439]
Control	5.42 [0.366]	5.37 [0.484]	5.33 [0.570]	4.79 [0.554]	4.37 [0.554]
Peak no. drinks in a sitting	(.26)	(.029)	(.005)	(.626)	(.700)	.046
Intervention	8.15 [0.330]	6.87 [0.400]	6.52 [0.392]	6.71 [0.411]	6.71 [0.392]
Control	8.68 [0.323]	8.03 [0.382]	7.98 [0.394]	6.92 [0.333]	6.92 [0.340]
Average no. drinks/week	(.23)	(.033)	(.007)	(.134)	(.700)	.032
Intervention	8.38 [0.549]	7.33 [0.627]	6.16 [0.558]	6.12 [0.534]	6.45 [0.555]
Control	9.59 [0.619]	9.47 [0.715]	8.90 [0.733]	7.47 [0.635]	7.26 [0.620]
No. times drunk in a typical week	(.61)	(<.001)	(.003)	(.078)	(.727)	<.001
Intervention	1.14 [0.086]	0.854 [0.069]	0.713 [0.070]	0.936 [0.099]	1.31 [0.157]
Control	1.11 [0.089]	1.24 [0.085]	1.10 [0.081]	1.33 [0.113]	1.70 [0.152]
Alcohol-related harmsc
23-item RAPIsum score	(.09)	(.447)	(.028)	(.041)	(.556)	.030
Intervention	14.1 [0.977]	6.22 [0.537]	4.96 [0.490]	4.58 [0.495]	5.80 [0.457]
Control	16.1 [0.987]	7.80 [0.617]	6.55 [0.605]	6.17 [0.644]	7.36 [0.581]
No. times drove after ≥3 drinks	(<.01)	(.005)	(.549)	(.998)	(.542)	.136
Intervention	4.69 [0.735]	0.929 [0.180]	0.890 [0.175]	1.03 [0.154]	2.24 [0.268]
Control	7.84 [1.28]	2.02 [0.334]	1.23 [0.257]	1.40 [0.242]	3.60 [0.882]
No. times taken foolish risks	(.184)	(.004)	(.685)	(.485)	(.261)	.036
Intervention	5.43 [0.753]	1.12 [0.227]	1.54 [0.353]	1.39 [0.301]	3.14 [0.780]
Control	6.58 [0.896]	2.24 [0.347]	1.72 [0.321]	2.23 [1.10]	4.80 [1.26]
Readiness-to-change
Readiness-to-change ruler	(.14)	(.644)	(.984)	(.312)	(.539)	.981
Intervention	4.50 [0.192]	4.58 [0.198]	4.59 [0.207]	4.34 [0.210]	4.44 [0.209]
Control	4.93 [0.211]	4.59 [0.189]	4.60 [0.196]	4.35 [0.202]	4.44 [0.199]

Notes: BAC = blood alcohol concentration; HED = heavy episodic drinking; RAPI = Rutgers Alcohol Problem Index.

^aValues in each postbaseline column represent: (p value) adjusted mean [SE]; (p value) in parentheses represents significance for treatment group differences uncorrected for multiple comparisons if overall trend p value is significant; if overall trend p value is not significant, (p value) represents significance for group differences with Bonferroni correction;

^btrend p value is from repeated measures analysis of covariance model adjusting for baseline measure and correlation of repeated measures over time; trend p value < .05 indicates a significant difference between treatment groups over time;

^cbaseline and 12 months represent average frequencies reported in past 12 months.