Skip to main content

Table 4 Comparison of smoking related variables in the web and telephone sample

From: Is web interviewing a good alternative to telephone interviewing? Findings from the International Tobacco Control (ITC) Netherlands Survey

  Web sample
(n = 1,668)
Telephone sample
(n = 404)
Significance
tests
Number of cigarettes smoked per day (mean; SD) 15.3; 8.1 15.0; 8.5 t = -0.54
Number of previous quit attempts (mean: SD) 2.0; 2.2 2.2; 2.5 t = 1.27
Time (in minutes) before smoking the first cigarette (mean; SD) 93.1; 189.2 86.5; 154.9 t = -0.69
Attitude towards smoking (%)    χ2 = 32.12***
Very positive 1.5 0.8 (df = 6)
Positive 12.7 9.2  
Neither positive nor negative 64.3 60.0  
Negative 17.6 23.3  
Very negative 2.4 6.7  
Refused 0.0 0.0  
Don't know 1.6 0.0  
Intention to quit smoking (%)    χ2 = 51.25***
Within the next month 5.6 7.8 (df = 5)
Within the next 6 months 19.3 20.0  
Sometime in the future, beyond 6 months 56.6 44.7  
Never 14.3 26.7  
Refused 0.0 0.3  
Don't know 4.2 0.6  
Self efficacy for quitting (%)    χ2 = 29.38***
Not at all sure 35.4 30.6 (df = 6)
Slightly sure 35.0 29.5  
Moderately sure 16.5 22.3  
Very sure 6.0 5.6  
Extremely sure 4.5 9.7  
Refused 0.0 0.3  
Don't know 2.7 1.9  
  1. * p < 0.05
  2. ** p < 0.01
  3. *** p < 0.001