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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