Diabetes has been defined on the basis of different biomarkers, including
fasting plasma glucose (FPG), 2-h plasma glucose in an oral glucose
tolerance test (2hOGTT), and HbA1c. We assessed the effect of different
diagnostic definitions on both the population prevalence of diabetes and
the classification of previously undiagnosed individuals as having diabetes
versus not having diabetes in a pooled analysis of data from
population-based health examination surveys in different regions.