Age-adjusted percent of people age 20 and over who have been told by a doctor that they have diabetes, or who are undiagnosed but have a fasting plasma glucose of at least 126 mg/dL or a hemoglobin A1c of at least 6.5 percent.
Data are based on interviews and physical examinations of a sample of the civilian non-institutionalized population. Data exclude women who reported having diabetes only during pregnancy. The NCHS reports data for seven-year or four-year periods (e.g., 1988-1994, 1999-2002, 2001-2004); Stanford CPI uses the middle year when data are reported for a seven-year period (e.g., 1991 for the period 1988-1994), and the third year when data are reported for a four-year period (e.g., 2001 for the period 1999-2002).
Estimates are age-adjusted to the year 2000 standard population using three age groups: 20-44 years, 45-64 years, and 65 years and over.
In 2002, there were substantial changes in the racial categories used by the Census Bureau. Time series by race that include data from both racial classifications should be interpreted with care. More details on the changes in racial categories.