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Table 3 Demographic comparison between NWAHCS and other comparable survey

From: Do people with risky behaviours participate in biomedical cohort studies?

  NWAHCS SAMSS
(NW Adelaide Study area)
Chi-square value P value
  n % n %   
Highest education level obtained Self completed Telephone 287.97 <0.001
Secondary 1751 45.3 1742 60.1   *
Trade / Apprenticeship / Certificate / Diploma 1641 42.4 659 22.7   *
Bachelor degree or higher 475 12.3 500 17.2   *
Total 3867 100.0 2901 100.0   
Marital status Self completed Telephone 1.76 0.62
Married or living with partner 2525 62.7 1830 63.1   
Separated/divorced 331 8.2 242 8.3   
Widowed 232 5.8 183 6.3   
Never married 940 23.3 647 22.3   
Total 4028 100.0 2903 100.0   
Work status Self completed Telephone 6.72 0.08
Employed 2266 56.5 1633 56.2   
Unemployed 173 4.3 128 4.4   
Student 223 5.6 124 4.3   
Home duties, retired, other 1349 33.6 1019 35.1   
Total 4011 100.0 2904 100.0   
Country of birth Self completed Telephone 8.67 0.03
Australia 2865 70.6 2114 72.8   *
UK or Ireland 645 15.9 389 13.4   *
Europe, The USSR & the Baltic States 332 8.2 249 8.6   
Asia, Other 217 5.4 153 5.3   
Total 4060 100.0 2904 100.0   
Gross annual household income Self completed Telephone 16.24 <0.001
Up to $40,000 1910 50.2 1239 49.4   
$40,001 – $80,000 1399 36.8 858 34.2   *
More than $80,000 492 13.0 414 16.5   *
Total 3802 100.0 2510 100.0   
  1. * denotes the category was statistically significantly different compared with SAMSS using adjusted standardized residuals greater than 2.0 and less than -2.0 (χ2 test)