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Table 6 Number (and percentage) of students reporting a perceived drinking norm within each gender-adjusted ordinal category

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
  Intervention Control Seen Not seen
Non-drinker 16 (6.8) 19 (6.8) 28 (7.3) 6 (5.4)
Within recommended limits* 92 (39.3) 102 (36.4) 143 (37.2) 43 (38.7)
Slightly hazardous** 42 (18.0) 36 (12.9) 63 (16.4) 14 (12.6)
Hazardous*** 45 (19.2) 67 (23.9) 79 (20.6) 28 (25.2)
Harmful**** 39 (16.7) 56 (20.0) 71 (18.5) 20 (18.0)
Geometric mean units per week (and 95% CI) - drinkers only 17.7 (15.6 to 20.2) 18.7 (16.6 to 21.0) 18.3 (16.5 to 20.3) 17.9 (14.8 to 21.6)
Geometric mean units per week (and 95% CI) 14.8 (12.7 to 17.3) 15.6 (13.5 to 18.0) 15.0 (12.6 to 19.4) 15.7 (13.3 to 17.0)
Median units per week 18 20 18 19
Mean AUDIT C score 6.4 (6.1 to 6.8) 6.5 (6.2 to 6.9) 6.5 (6.2 to 6.8) 6.4 (5.8 to 7.1)
‘Higher risk’ drinkers 204 (86.1) 249 (87.4) 338 (86.7) 100 (87.7)
Median units on heaviest drinking occasion 17.5 16 17 17
  1. *1-14 units for women; 1–21 for men; **15-21 for women; 22 to 28 for men; *** 22–35 for women; 29 to 50 for men; **** >35 for women; >50 for men.