Table 6.

Multivariate Cox regression analysis with stepwise backward selection examining time to relapse within the 3-month follow-up period

Variables	Significance (P-value)	β	SE	OR (95% CI)
Included in final model
UPPS scale	0.04	0.032	0.016	1.032 (1.001–1.065)
P3d amplitude	0.05	0.199	0.104	1.220 (0.995–1.497)
Not included in final model
Craving	0.50
FHA	0.12
Medication	0.16
Inhibition-error rate	0.95

Notes: β represents the slope of the regression line. The outcome variable assessed was the time to relapse within the 3-month follow-up window, and the unit of time for our analysis was 1 day. Participants remaining abstinent from alcohol by the end of the study window constituted the censored cases for this analysis. Initially, the six variables were included in the model. In a stepwise fashion, factors that showed no or limited statistically significant association with relapse adjusted for the remaining factors in the model were deleted. Two variables remained at the end: P3d amplitude and the UPPS scale score. Both variables constituted the best predictors of relapse, and they significantly and slightly significantly predicted the timing of relapse (UPPS, OR 1.032, 95% CI 1.001–1.065, P=0.04; P3d, OR 1.220, 95% CI 0.995–1.497, P=0.05).

Abbreviations: UPPS, urgency (lack of), premeditation, perseverance (lack of), sensation seeking; OR, odds ratio; CI, confidence interval; SE, standard error; FHA, family history of alcoholism.