Table 1. Results ANCOVA for intention-to-treat analyses (ITT) 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	40.8 (3.3)	56.8 (3.3)	F(1. 606) = 11.608	0.001	0.278
QFI t2	32.3 (2.1)	44.1 (2.1)	F(1. 606) = 15.966	<0.001	0.327
TFB (amount of alcohol in gram per day over the past 7 days) t1	34.3 (1.3)	43.7 (1.3)	F(1. 606) = 26.664	<0.001	0.419
TFB t2	25.7 (1.5)	38.6 (1.4)	F(1. 606) = 44.369	<0.001	0.54
Secondary outcomes
Days of Binge Drinking within the past 30 days t1	8.1 (0.4)	14.6 (0.4)	F(1. 606) = 114.387	<0.001	0.873
Binge drinking t2	4.6 (0.4)	14.5 (0.4)	F(1. 606) = 297.033	<0.001	1.4
Days of drunkenness within the past 30 days	2.9 (0.2)	4.6 (0.2)	F(1. 606) = 23.208	<0.001	0.392
Drunkenness t2	1.5 (0.2)	4.4 (0.2)	F(1. 606) = 83.469	<0.001	0.742

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