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Table 4 Sample comparisons to the latest population profile for NSW

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 Landline frame Mobile frame Landline plus mobile only Both frames combined # 2011 Census
Total (%) p-value Total (%) p-value % p-value % p-value
Age groups 0-15 14.1 <0.001 11.4 0.03 13.4 <0.001 12.1 0.01 20.5
16-24 4.1 12.4 5.8 7.3 11.6
25-34 5.6 23.1 10.2 13.2 13.6
35-44 7.6 15.0 8.2 9.9 14.1
45-54 13.0 16.9 12.7 13.4 13.8
55-64 21.6 12.9 19.8 17.4 11.7
65-74 18.4 6.5 16.4 14.1 7.8
75-high 15.6 1.7 13.5 12.5 6.9
Sex Male 38.9 0.04 48.4 0.85 40.1 0.07 42.8 0.20 49.3
Female 61.1 51.6 59.9 57.2 50.7
Aboriginality Aboriginal 2.2 0.86 2.6 0.94 2.6 0.96 2.6 0.96 2.5
Non-Aboriginal 97.8 97.4 97.4 97.4 97.5
Country of birth Australia 79.4 0.02 64.9 0.42 77.1 0.07 73.4 0.30 68.6
Overseas 20.6 35.1 22.9 26.6 31.4
Marital status Married 54.1 <0.001 54.0 0.76 51.3 0.01 51.5 0.08 49.4
Widowed 13.7 3.1 12.2 11.1 5.8
Separated 4.0 3.3 3.9 3.7 3.1
Divorced 12.3 7.1 11.7 10.2 8.3
Never married 15.9 32.5 20.9 23.5 33.4
Income* < $20,000 24.0 0.02 12.0 0.04 23.4 0.02 21.9 0.05 13.7
$20,001-$40,000 19.8 15.4 19.2 18.5 19.8
$40,001-$60,000 15.1 14.9 15.3 14.7 16.9
$60,001-$80,000 10.4 14.0 10.8 11.2 19.8
$80,000 plus 30.8 43.7 31.3 33.7 29.8
  1. Notes: # Calculation numbers for combined frame = ((Sa+λSab A)+ (Sb+(1-λ)Sab B) where S =sample; λ=overlap adjustment (set to 0.5); A landline sample frame; B denotes mobile sample frame; a landline-only phone users; b mobile-only phone users; ab denotes both mobile phone and landline users.
  2. * Census income information was converted from weekly income to annual income for the comparison.
  3. χ2 testing, setting the significance level of p<0.05, was used for the comparisons between the sample demographic categories and the population profile (2011 census).