The addition of the OGTT also allowed assessment of the agreement between diagnostic categories defined by fasting and 2-h plasma glucose. Although this was examined in NHANES 1988–1994 in those aged 40–74 years (9), a reexamination is appropriate given 1) the measurements in a wider age range in NHANES 2005–2006, 2) the change in
criteria for IFG (lowered from 110 to 100 mg/dl) since that report (8), and 3) the
rising prevalence of glucose abnormalities (3) and obesity (10).