Diabetes Care, Vol 21, Issue 11 1886-1888, Copyright © 1998 by American Diabetes Association
Lack of agreement between the World Health Organization Category of impaired glucose tolerance and the American Diabetes Association category of impaired fasting glucose
FJ Gomez-Perez, CA Aguilar-Salinas, JC Lopez-Alvarenga, J Perez-Jauregui, LE Guillen-Pineda and JA Rull
Instituto Nacional de la Nutricion Salvador Zubiran, Mexico City, Mexico.
OBJECTIVE: To study the concordance between the 1997 American Diabetes
Association (ADA) impaired fasting glucose (IFG) category with the World
Health Organization (WHO) impaired glucose tolerance (IGT) status in a
population with a high prevalence of diabetes. RESEARCH DESIGN AND METHODS:
We analyzed the oral glucose tolerance tests (OGTTs) carried out at the
Instituto Nacional de la Nutricion Salvador Zubiran (INNSZ) central
laboratory from June to December 1997. We included patients with fasting
plasma glucose (FPG) between 60 and 160 mg/dl. The results from the glucose
tolerance test were selected as the gold standard. RESULTS: Among the 1,802
glucose tolerance test results available for analysis, 1,706 fulfilled the
requirements to be included. Diabetes and IGT were remarkably more
frequently diagnosed when the WHO criteria were applied. The new ADA
criteria failed to diagnose 69% of WHO diabetic patients and the vast
majority of WHO glucose-intolerant subjects. Using the new criteria, 82%
were considered normal. Of the IFG subjects, 39% were classified as
diabetic and 23% were normal according to the 2-h postchallenge glucose
values. Only 37% of the IFG patients were, in fact, glucose intolerant
according to the WHO criteria. CONCLUSIONS: Our results clearly show that
the 1997 ADA criteria are less sensitive for diagnosing diabetes than
OGTT-based WHO criteria. Even more important, there is poor agreement
between the WHO category of IGT and the ADA category of IFG.