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Table 1 Age and sex comparison between 2001 Census and NWAHCS

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

  ABS 2001 Census NWAHCS
    Unweighted Weighted
  n % n % Chi-square value P value n % Chi-square value P value
Sex      1.54 0.21    0.23 0.64
Male 159919 48.5 1930 47.5    1985 48.9   
Female 169695 51.5 2130 52.5    2075 51.1   
Age group      373.13 <0.001    5.14 0.40
18 to 29 years 70665 21.4 467 11.5*    899 21.4   
30 to 39 years 66747 20.3 676 16.7*    790 20.3   
40 to 49 years 61669 18.7 876 21.6*    785 18.7   
50 to 59 years 49003 14.9 795 19.6*    600 14.9   
60 to 69 years 35300 10.7 622 15.3*    448 10.7   
70 years and over 46230 14.0 624 15.4*    538 14.0   
Area of residence      2.32 0.13    1.69 0.19
Western Suburbs 182706 55.4 2299 56.6    2209 54.4   
Northern Suburbs 146908 44.6 1761 43.4    1851 45.6   
Total 329614 100.0 4060 100.0    4060 100.0   
  1. * 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)