Table 5.

Model-adjusted stepwise models of predictors of engagement in Combined, Web, and Peer Booster arms.

Selected candidate predictors	Combined		Web Boosters	Peer Boosters
	χ2 (df)	P value	χ2 (df)	P value	χ2 (df)	P value
Treatment arm	10.0 (2) a	.01	NAb	NA	NA	NA
Education	17.9 (4)	.001	9.6 (4)	.047	8.7 (4)	.07
Income	12.5 (4)	.02	5.9 (4)	.20	—c	—
Employed	3.3 (2)	.19	—	—	6.2 (2)	.04
Rank	6.0 (2)	.049	10.5 (2)	.005	—	—
Anxiety (GADd)	4.6 (2)	.10	3.7 (2)	.16	—	—
Alcohol use severity (AUDITe)	2.6 (2)	.27	—	—	—	—
Confidence can reduce alcohol use	3.5 (2)	.18	—	—	—	—
Gender	—	—	4.2 (2)	.12	8.2 (2)	.02
Motive: social	—	—	3.4 (2)	.18	3.6 (2)	.16
Deployed	—	—	3.9 (2)	.14	—	—
Binge drinking frequency	—	—	4.1 (2)	.13	—	—
Traumatic event	—	—	5.7 (2)	.06	—	—
Marital status	—	—	—	—	13.4 (6)	.02
Depression (PHQf)	—	—	—	—	6.0 (2)	.049
Motive: enhancement	—	—	—	—	10.1 (2)	.01
Motive: coping with depression	—	—	—	—	2.9 (2)	.23
Drink and drive	—	—	—	—	3.8 (2)	.15

^aItalicized values indicate statistical significance at the α<.05 threshold.

^bNA indicates that the predictor (ie, treatment arm) was not included as a candidate predictor in the model. All variables selected in each model were reported.

^c—: Indicates that candidate variable was not retained in the model.

^dGAD: General Anxiety Disorder Questionnaire.

^eAUDIT: Alcohol Use Disorders Identification Test.

^fPHQ: Patient Health Questionnaire.