Prevalence of Total, Diagnosed, and Undiagnosed Diabetes in Adults: United States, August 2021-August 2023.

Introduction: This report presents the prevalence of diagnosed, undiagnosed, and total diabetes in U.S. adults during August 2021-August 2023. Trends in diagnosed, undiagnosed, and total diabetes prevalence in adults from 1999-2000 through August 2021-August 2023 are also shown.

Methods: Prevalence of self-reported diagnosed, undiagnosed, and total diabetes was estimated using August 2021-August 2023 National Health and Nutrition Examination Survey data. Diagnosed diabetes was defined as answering "yes" to the question: "Other than during pregnancy, have you ever been told by a doctor or health professional that you have diabetes or sugar diabetes?" Undiagnosed diabetes was defined as reporting never receiving a diabetes diagnosis from a healthcare provider and 8- to 24-hour fasting plasma glucose greater than or equal to 126 mg/dL or hemoglobin A1c greater than or equal to 6.5%. Total diabetes was the combined prevalence of diagnosed and undiagnosed diabetes. Standard errors of percentages were estimated using Taylor series linearization. Pairwise differences between groups were evaluated using t statistics, and stated differences were statistically significant at p less than 0.05. Orthogonal contrasts were used to test for linear trends except for trends over time, where a linear regression model was used accounting for the unequal time between survey cycles.

Key findings: During August 2021-August 2023, the prevalence of total, diagnosed, and undiagnosed diabetes in U.S. adults was 15.8%, 11.3%, and 4.5%, respectively. The prevalence of total and diagnosed diabetes was higher in men than among women and decreased with increasing educational attainment. The prevalence of total, diagnosed, and undiagnosed diabetes increased with increasing age and increasing weight status. The age-adjusted prevalence of total and diagnosed diabetes increased from 9.7% to 14.3% and from 5.9% to 10.1%, respectively, between 1999-2000 and August 2021-August 2023.No change was seen between 2017-March 2020 and August 2021-August 2023.