Table 3.

Risk ratio and risk difference of transition to lower AUDIT category and change in AUDIT mean scores from baseline to 6 month follow-up, Intention to treat analysis (ITT)

		AUDIT risk level at follow-up %				Change in AUDIT risk level
	n	l	II	III	IV	%	Risk ratio (95% CI)	Risk difference (95% CI)
Brief structured intervention	107	29.9	40.2	13.1	16.8	68.2	1.12 (0.93 to 1.37)	0.08 (−0.05 to 0.20)
Usual care	117	25.6	40.2	14.5	19.7	60.7	Reference
	n	Baseline mean (sd)		Follow-up mean (sd)			Mean difference (95%CI)	Mean difference between groups (95% CI)
AUDIT score
Brief, structured intervention	107	19.7 (5.8)		11.7 (6.9)			−7.9 (−9.3 to −6.4)	0.87 (−1.0 to 2.8)
Usual care	117	19.1 (5.7)		12.1 (7.3)			−7.1 (−8.4 to −5.7)
AUDIT C score
Brief, structured intervention	107	7.8 (2.2)		5.0 (2.8)			−2.8 (−3.3 to −2.3)	0.20 (−0.53 to 0.92)
Usual care	117	7.6 (2.0)		5.0 (2.8)			−2.6 (−3.1 to −2.1)

AUDIT risk levels: I ‘low risk’ II ‘hazardous III ‘harmful IV ‘probable dependence’