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Table 2 Underestimation of Aboriginal status on death records compared with estimates based on linked 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 identification in death record,
n (%,95% CI)
Aboriginal identification in hospital admission for cardiovascular disease
  Positive negative or unidentified Total relative risk (95% CI)
Positive 654
(92.0; 90.0-94.0)
60 714  
Negative 188
(1.0; 0.9-1.2)
18,048 18,236  
   Sub total 842
(4.4; 4.1-4.7)
18,108 18,950 1.9
(1.5 to 2.4)
Unidentified 73
(8.5; 6.6-10.4)
786 859  
   Grand total 915
(4.6; 4.3-4.9)
18,894 19,809  
  1. Total Aboriginal cases identified from all sources = 975; underestimation of Aboriginal status in mortality data alone = 26.8%