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Table 3 Comparison of the demographic profile of the mobile frame and the landline frame respondents

From: Inclusion of mobile phone numbers into an ongoing population health survey in New South Wales, Australia: design, methods, call outcomes, costs and sample representativeness

Demographic group

Mobile frame

Landline frame

Mobile only (%)

p-value

Both (%)

p-value

Total (%)

p-value

Land-line only (%)

Both (%)

Total (%)

Age groups

0-15

8.5

<0.001

12.3

<0.001

11.4

<0.001

6.0

15.8

14.1

16-24

17.1

10.8

12.4

0.5

4.9

4.1

25-34

41.8

16.6

23.1

1.6

6.4

5.6

35-44

12.3

16.0

15.0

5.2

8.0

7.6

45-54

10.1

19.3

16.9

7.3

14.3

13.0

55-64

7.3

14.9

12.9

16.8

22.6

21.6

65-74

2.5

7.9

6.5

23.3

17.3

18.4

75-high

0.3

2.2

1.7

39.3

10.6

15.6

Sex

Male

48.4

0.049

48.3

0.052

48.4

0.052

42.9

38.0

38.9

Female

51.6

51.7

51.6

57.1

62.0

61.1

Aboriginality

Aboriginal

5.1

0.049

1.8

0.76

2.6

0.78

2.4

2.2

2.2

Non-Aboriginal

94.9

98.2

97.4

97.6

97.8

97.8

Country of birth

Australia

60.8

<0.001

79.4

1.00

64.9

<0.001

76.6

80.1

79.4

Overseas

39.2

20.6

35.1

23.4

19.9

20.6

Marital status

Married

31.3

<0.001

61.8

0.003

54.0

<0.001

45.3

56.0

54.1

Widowed

1.9

3.5

3.1

28.7

10.5

13.7

Separated

3.5

3.2

3.3

3.4

4.1

4.0

Divorced

7.4

7.0

7.1

10.8

12.6

12.3

Never married

55.8

24.5

32.5

11.8

16.8

15.9

Income

< $20,000

19.0

0.32

9.9

0.001

12.0

0.01

46.8

19.7

24.0

$20,001-$40,000

14.7

15.7

15.4

24.5

18.9

19.8

$40,001-$60,000

16.8

14.3

14.9

9.3

16.2

15.1

$60,001-$80,000

14.2

13.9

14.0

4.1

11.5

10.4

$80,000 plus

35.3

46.3

43.7

15.2

33.7

30.8

  1. Notes: Chi-squared testing, setting the significance level of p<0.05, was used for the comparisons between the mobile phone frame (mobile-only, both and total) sample demographic categories and the total landline frame sample.