Table 2.

Logistic regression analysis and area under the curve of the ROC curves predicting PEth > 20ng/mL based on self-reported aclohol use by TLFB

Self-reported alcohol use**	Odds ratio (95% CI)*	P-value	Area under the curve (95% CI)
Mean number of drinks per day, past 21 days
• Overall sample	1.73 (1.41, 2.11)	<0.0001	0.80 (0.74, 0.85)
• Individual trial samples
⚪ MALD	4.31 (1.61, 11.54)	0.004	0.78 (0.69, 0.88)
⚪ At-risk drinking	1.57 (1.04, 2.36)	0.035	0.68 (0.55, 0.80)
⚪ Alcohol use disorder	1.26 (1.01, 1.57)	0.04	0.68 (0.54, 0.82)
Sensitivity analyses (among overall sample only)
Mean number of drinks per day, past 14 days	1.66 (1.37, 2.00)	<0.0001	0.79 (0.73, 0.85)
Mean number of drinks per day, past 7 days	1.60 (1.34, 1.91)	<0.0001	0.78 (0.72, 0.84)
Mean number of heavy drinking days, past 21 days	1.24 (1.13, 1.36)	<0.0001	0.74 (0.68, 0.80)

CI, Confidence interval; ROC, Receiver operating characteristics curve; TLFB, Alcohol Timeline Followback;

^*this is the OR of PEth > 20ng/mL. The OR are calculated based on 1 unit increase in each of the TLFB measures