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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.