eTable 2. Results of ANCOVA for complete cases (sensitivity analysis) for t1 and t2.

Outcome	IG: mM (SE)	CAU/WL: mM (SE)	F value (degrees of freedom)	Significance	Cohen’s d
Primary outcomes
QFI (amount of alcohol in gram per day over the past 30 days) t1	30.5 (4.5)	59.8 (4.1)	F(1.422) = 22.903	<0.001	0.468
QFI t2	24.6 (2.6)	46.1 (2.3)	F(1.422) = 37.782	<0.001	0.598
TFB (amount of alcohol in gram per day over the past 7 days) t1	30.2 (1.7)	42.9 (1.5)	F(1.422) = 31.138	<0.001	0.544
TFB t2	21.5 (2.0)	39.4 (1.8)	F(1. 422) = 45.102	<0.001	0.655
Secondary outcomes
Days of binge drinking within the past 30 days t1	9.5 (0.6)	17.0 (0.6)	F(1. 418) = 80.264	<0.001	0.876
Binge drinking t2	5.3 (0.6)	16.5 (0.5)	F(1. 419) = 206.617	<0.001	1.407
Days of drunkenness within the past 30 days	3.5 (0.3)	5.2 (0.3)	F(1. 418) = 13.497	<0.001	0.358
Drunkenness t2	2.1 (0.3)	4.8 (0.3)	F(1. 419) = 42.223	<0.001	0.637

ANCOVA. analysis of covariance; CAU/WL. care as usual/waiting list; IG. intervention group; mM. marginal mean; QFI. Quantity-Frequency Index;

SE. standard error; TFB. Timeline Follow-Back method; t1 and t2. measurement timepoints after 3 and 6 months