Test agreement for classifying diabetes in Indigenous Australians
Article first published online: 25 SEP 2007
Australian and New Zealand Journal of Public Health
Volume 30, Issue 2, pages 128–131, April 2006
How to Cite
Daniel, M., Rowley, K. G., Marks, E. and O'Dea, K. (2006), Test agreement for classifying diabetes in Indigenous Australians. Australian and New Zealand Journal of Public Health, 30: 128–131. doi: 10.1111/j.1467-842X.2006.tb00104.x
- Issue published online: 25 SEP 2007
- Article first published online: 25 SEP 2007
- Revision requested: September 2005 Accepted: November 2005
Objective: To evaluate for Indigenous Australians the agreement between a fasting plasma glucose (FPG) criterion of 7.0 mmol/L and diabetes test results using a two-hour oral glucose tolerance test (OGTT), comparing relationships between test agreement and prevalence to similar studies.
Methods: Screening was undertaken in 25 remote settlements. Agreement between FPG and OGTT results was evaluated using the kappa coefficient (chance-corrected agreement).
Results: Participants (n=3,249) ranged from 15–94 years. Kappa ranged from 0.70-0.77 for diabetes prevalence of 5–30%, with overall agreement of 0.76. In comparison studies, the relationship between kappa and diabetes prevalence was similar, but with kappa 0.21-0.48.
Conclusions and Implications: A FPG test with a 7.0 mmol/L cut-off is a reliable screening method, relative to the OGTT, for remote Indigenous settlements. The level of agreement between the FPG test and the OGTT for the Indigenous population surveyed is superior by far to agreement reported for non-Indigenous samples.