An exploratory cluster randomised trial of a university halls of residence based social norms marketing campaign to reduce alcohol consumption among 1st year students

Table 5 Odds ratios / b-coefficients for intervention effects on descriptive and injunctive norms

		Intention to treat			Per protocol
		N = 542/505	N = 506/504	p	N = 498	N = 498	p
Descriptive norm – units per week*	Intervention	0.89 (0.56 to 1.42)	1.00 (0.66 to 1.51)	0.99	0.65 (0.46 to 0.92)	0.61 (0.44 to 0.84)	0.01
Descriptive norm – units per week*	Pre university alcohol consumption level		1.22 (1.17 to 1.27)	<0.01		1.23 (1.18 to 1.28)	<0.01
Injunctive norm**	Intervention	-0.80 (-1.79 to 0.20)	-0.79 (-1.76 to 0.18)	0.11	-0.98 (-1.87 to -0.08)	-0.98 (-1.86 to -0.11)	0.03
	Pre university alcohol consumption level		0.06 (-0.06 to 0.19)	0.32		0.06 (-0.06 to 0.19)	0.31

Coefficients significant at the 5% level are highlighted in bold. P-values relate to final multivariate models. All models adjust for age, sex, survey type and university. Models in 2nd and 5th column also adjusted for reported pre-university drinking level.
*Ordinal logistic regression models ** Linear regression models.

ISSN: 1747-597X