Table 2.

Effect estimates

	Effect ratio (95% CI)
	Hypothesis 1 (control and intervention)/cohort	Hypothesis 2 intervention/control
1. Frequency of drinking	0.98 (0.94 to 1.02) P = 0.27	0.99 (0.94 to 1.03) P = 0.54
2. Typical occasion quantity	0.98 (0.95 to 1.02) P = 0.31	0.99 (0.96 to 1.03) P = 0.63
3. Overall volume consumed	0.96 (0.93 to 1.01) P = 0.09	0.97 (0.93 to 1.02) P = 0.25
4. Frequency of hangover	1.02 (0.96 to 1.09) P = 0.48	0.94 (0.88 to 1.01) P = 0.09

All outcomes had a reference period of the preceding 4 weeks.