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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)