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Diabetes and Prediabetes Among Adults in Los Angeles County and the United States, 1999-2006 and 2007-2014.

Objective-This report presents the prevalence of diagnosed diabetes, undiagnosed diabetes, total diabetes, and prediabetes among adults aged 20 and over in Los Angeles County and the United States in 1999-2006 and 2007-2014. The prevalence of diagnosed diabetes, total diabetes, and prediabetes in 2007-2014 are presented by age, sex, and race and Hispanic origin. Methods-Data are from in-home interviews and laboratory testing conducted as part of the National Health and Nutrition Examination Survey (NHANES). Los Angeles County has been selected with certainty in every NHANES cycle since 1999. Sample persons in Los Angeles County were selected and sample weights constructed so that estimates represent the county. Prevalence and 95% confidence intervals for diagnosed, undiagnosed, total diabetes, and prediabetes were estimated using self-reported diagnosis of diabetes, plasma fasting glucose, and hemoglobin A1c. Differences in prevalence were tested between Los Angeles County and the United States, between 1999-2006 and 2007-2014, and among demographic subgroups. Results-The age-adjusted prevalence of total diabetes among adults in Los Angeles County increased from 10.5% in 1999-2006 to 14.4% in 2007-2014. In 2007-2014, 40.2% of adults in Los Angeles County had prediabetes. There were no significant differences in the overall prevalence of diagnosed diabetes, undiagnosed diabetes, total diabetes, or prediabetes between Los Angeles County and the United States in 1999-2006 or 2007-2014. The prevalence of diagnosed diabetes, total diabetes, and prediabetes increased with age in both Los Angeles County and the United States. The prevalence of total diabetes was higher in non-Hispanic black adults, Hispanic adults, and Mexican-American adults than in non-Hispanic white adults in both Los Angeles County and the United States.