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

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

  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
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
  1. 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.
  2. *Ordinal logistic regression models ** Linear regression models.