Table 3.

Differences between TLFB and daily reports at the daily level

	Models predicting alcohol use outcomes
	No. of drinks				Drinking day			Heavy drinking day
Fixed effects	B	SE	t	p	OR	[95% CI]	p	OR	[95% CI]	p
Intercept	1.36	0.10	13.05	<.001	0.31	[0.26, 0.38]	<.001	0.16	[0.13, 0.21]	<.001
Report (L1)	3.16	0.18	17.50	<.001	1.25	[1.12, 1.39]	<.001	1.11	[0.96, 1.29]	.145
Day no. (L2)	-0.03	0.00	-5.99	<.001	0.96	[0.95, 0.97]	<.001	0.96	[0.95, 0.98]	<.001
Time between methods (L3)	-0.01	0.01	-0.56	.580	1.00	[0.98, 1.01]	.696	1.01	[0.99, 1.03]	.421
Baseline typical weekly drinks (L3)	0.06	0.01	4.36	<.001	1.03	[1.01, 1.06]	<.001	1.06	[1.04, 1.09]	<.001

	Models predicting alcohol consequences outcomes
	No. positive consequences				No. negative consequences			Any positive consequence			Any negative consequence
	B	SE	t	p	OR	[95% CI]	p	OR	[95% CI]	p	OR	[95% CI]	p
Intercept	2.81	0.15	18.20	<.001	0.60	[0.49, 0.75]	<.001	10.72	[6.73, 17.05]	<.001	0.79	[0.56, 1.11]	.172
Report type (L1)	0.51	0.11	4.53	<.001	0.97	[0.84, 1.13]	.736	1.64	[1.05, 2.56]	.029	0.80	[0.61, 1.05]	.114
Day number (L2)	-0.03	0.01	-4.67	<.001	1.00	[0.99, 1.01]	.886	0.96	[0.94, 0.98]	<.001	1.00	[0.98, 1.02]	.948
Time between methods (L3)	-0.03	0.01	-2.35	.021	0.99	[0.97, 1.01]	.488	0.97	[0.93, 1.01]	.174	1.00	[0.97, 1.03]	.773
Baseline typical weekly drinks (L3)	-0.01	0.01	-0.50	.616	1.01	[0.99, 1.03]	.477	0.99	[0.95, 1.03]	.699	1.02	[0.99, 1.05]	.207

Notes: TLFB = Timeline Followback; no. = number; OR = odds ratio; CI = confidence interval; LL=lower limit; UL=upper limit; L1 = Modeled at Level 1 portion of the model; L2 = Level 2; L3 = Level 3; Report type coded 0 = daily, 1 = TLFB. As such, intercept = outcome reported daily and effect of report = difference in the outcome between daily and TLFB report; bold effects represent significant differences between methods (p < .01). Daily models included a random slope effect of report type for number of drinks and number of positive consequences.