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Accuracy of asthma statistics from death certificates in South Australia
D A Campbell1, G McLennan, J R Coates
1Thoracic Medicine Unit, Queen Elizabeth Hospital, Woodville South, SA.
Objective:
To assess the accuracy of asthma statistics from death certificates in South Australia.
Design:
Comparison of death certificate coding with expert panel assessments of causes of death after interviews with certifying doctors, regular medical practitioners and close acquaintances of the deceased.
Subjects:
261 subjects for whom the term "asthma", "asthmatic" or "asthmaticus" was recorded in Part I or Part II of death certificates lodged in the 24-month period from May 1988.
Main Outcome Measures:
Sensitivity, specificity and predictive value of death certificate coding, with expert panel assessments as the reference standard.
Results:
About 95% of deaths assessed as definitely due to asthma were so coded from death certificates, but only 69% of deaths assessed by the panel as not due to asthma were coded to a "non-asthmatic" cause. Of the 129 deaths coded to asthma, the percentage assessed as definitely or likely to be due to asthma was 56%. For ages under 65 years, this figure was 84% compared with only 38% for older subjects.
Conclusion:
The accuracy of death certificate data on asthma for the age group 65 years and over would be too low at present for most epidemiological purposes.