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Table 2 SEIFA Index of relative socio-economic disadvantage – comparison between 2001 Census and NWAHCS

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

  ABS 2001 Census NWAHCS weighted Chi-square value P value
  n % n %   
2001 SEIFA Index of Relative Socio-economic Disadvantage – quintile      23.59 <0.001
Lowest quintile 124457 37.8 1504 37.0   
2nd quintile 65806 20.0 842 20.7   
3rd quintile 88351 26.8 1174 28.9   *
4th quintile 43479 13.2 445 11.0   *
Highest quintile 7521 2.3 94 2.3   
Total 329614 100.0 4060 100.0   
  1. Note: Quintiles are based on NW Adelaide population, 18+ years
  2. * denotes the category was statistically significantly different compared with ABS Census 2001 using adjusted standardized residuals greater than 2.0 and less than -2.0 (χ2 test)