Tablle 2. Inferential statistics on frequency of binge drinking, amount consumed, and associated consequences in groups over time.

	Total sample (n = 3802)			Those who had already consumed alcohol (n = 2779)
	Adj. OR	95% CI	p	Adj. OR	95% CI	p
Frequency of at least monthly binge drinking
– Time effect	1.59	[1.30; 1.94]	<0.001	1.42	[1.15; 1.74]	0.001
– Group effect	0.95	[0.69; 1.30]	0.730	0.96	[0.70; 1.30]	0.783
– Interaction effect: group × time	1.30	[0.97; 1.72]	0.071	1.38	[1.03; 1.85]	0.028
	Adj. b	95% CI	p	Adj. b	95% CI	p
No. of drinks consumed per occasion
– Time effect	0.49	[0.37; 0.62]	<0.001	0.50	[0.37; 0.64]	<0.001
– Group effect	– 0.03	[– 0.29; 0.23]	0.838	0.00	[– 0.28; 0.27]	0.988
– Interaction effect: group × time	0.17	[– 0.01; 0.35]	0.054	0.19	[0.00; 0.38]	0.047
Total CRAFFT-d score
– Time effect	0.05	[0.00; 0.10]	0.035	0.04	[– 0.02; 0.10]	0.193
– Group effect	0.16	[0.07; 0.24]	<0.001	0.20	[0.08; 0.31]	<0.001
– Interaction effect: group × time	– 0.02	[– 0.09; 0.05]	0.635	– 0.02	[– 0.11; 0.07]	0.569

Adj. b: Adjusted regression coefficient b; Adjusted OR: Adjusted odds ratio; CRAFFT: Car, Relax, Alone, Forget, Friends, Trouble (screening test); 95% CI: 95%

confidence interval; p: Observed significance level

School type, socioeconomic status, religion, and friends’ consumption were controlled for in all analyses.