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Table 3 The relationship between selected demographic factors and underestimation of Aboriginal status in hospital morbidity and death records

From: Under-ascertainment of Aboriginality in records of cardiovascular disease in hospital morbidity and mortality data in Western Australia: a record linkage study

  Aboriginal positive
Demographic, n (%; 95% confidence interval) Index event Underestimate if ever-identified
Gender   
   male 1555 1835 (18; 16-20)
   female 1505 1806 (20; 18-22)
Age (years)   
   0-34 421 450 (7; 4-9)
   35-64 2002 2242 (12; 11-13)
   65+ 637 943 (48; 44-52)
SEIFA code*   
   1 most disadvantaged 930 995 (7; 5-9)
   2 894 1028 (15; 13-18)
   3 616 801 (30; 26-33)
   4 516 650 (26; 22-30)
   5 least disadvantaged 104 160 (54; 44-63)
ARIA code#   
   1 metropolitan 623 866 (39; 35-43]
   2 urban 302 495 (64; 59-70)
   3 rural 525 745 (42; 37-46)
   4 remote 599 677 (13; 10-16)
   5 very remote 1070 1134 (6; 4-7)
  1. Chi-square analysis p < 0.0001; *SEIFA = Socio-economic Indexes for Areas (relative disadvantage is associated with a low number); #ARIA = Accessibility and Remoteness Index of Australia (remoteness is associated with a high number).