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Table 1 Baseline characteristics of students

From: Children and youth perceive smoking messages in an unbranded advertisement from a NIKE marketing campaign: a cluster randomised controlled trial

Characteristic Exposure ad
(N = 205)
Neutral ad
(N = 192)
P-value
Age, mean (SD) 14.0 (1.4) 14.1 (1.7) 0.86*
Male, n (%) 83 (40.5) 76 (39.6) 0.85
Grade, n (%)    
7 54 (26.3) 56 (29.2) 0.43
8 47 (22.9) 44 (22.9)  
9 60 (29.3) 50 (26.0)  
10 23 (11.2) 14 (7.3)  
11 21 (10.2) 28 (14.6)  
Family affluence score, mean (SD) 5.5 (1.2) 5.4 (1.2) 0.19*
Smoking status, n (%)    
Nonsusceptible never smoker 119 (58.6) 96 (50.5) 0.30
Susceptible never smoker 30 (14.8) 40 (21.1)  
Experimenter 43 (21.2) 41 (21.6)  
Established smoker 11 (5.4) 13 (6.8)  
Ice hockey fan, n (%)    
Very much 67 (32.8) 64 (33.5) 0.30
A bit 55 (27.0) 60 (31.4)  
Not really 47 (23.0) 30 (15.7)  
No 35 (17.2) 37 (19.4)  
Test time, n (%)    
Morning 166 (81.0) 134 (69.8) 0.01
Afternoon 39 (19.0) 58 (30.2)  
  1. * P-values are based on the Wilcoxon rank sum test for two variables; all other p-values are based on contingency tables for categorical variables.
  2. † Ranges from 1 to 7
  3. ‡ Grade 7 and 8 questionnaires were administered during one class period. Grade 9 to 11 questionnaires were administered either in the morning or afternoon.