Table 3

Population characteristics of responding and non-responding subjects. Comparing 46 non-responders participating in the non-response analysis with the 1131 responders in the original study population.

Total

Total sample of non-responders

Non-responders not participating in the telephone interview

Non-responders participating in the telephone interview

Responders in the original study

Comparison ¶

% (n) 100 (84)

% (n) 100 (38)

% (n) 100 (46)

% (n) 100 (1131)

OR

95%CI

Sex

Male (Ref)

20 (17)

24 (9)

17 (8)

20 (226)

Female

80 (67)

76 (29)

83 (38)

80 (905)

1.2

0.5 – 2.6

Age distribution:

≥ 41 (Ref)

58 (49)

61 (23)

57 (26)

67 (755)

≤ 40

42 (35)

39 (15)

43 (20)

33 (376)

1.5

0.9 – 2.8

Smoke-free at first call:

No (Ref)

73 (61)

76 (29)

70 (32)

77 (875)

Yes

27 (23)

24 (9)

30 (14)

23 (256)

1.5

0.8 – 2.8

Using nicotine* at first call:

Yes (Ref)

82 (69)

87 (33)

78 (36)

89 (1010)

No

18 (15)

13 (5)

22 (10)

11 (121)

2.3

1.1 – 4.8

*Total consumption of nicotine, including smoked and smoke-free tobacco and NRT.

¶Comparing non-responders participating in the telephone interview to responders

Tomson et al. BMC Public Health 2005 5:52   doi:10.1186/1471-2458-5-52