1623-P: Changes in Glycemic and Insulin Distributions among U.S. Adults without Diabetes by Socioeconomic Position, 1988-2016

National surveys in the U.S. have shown an increased incidence of diagnosed diabetes through 2009 followed by consistent reductions. Whether similar population-level changes are occurring in A1C, fasting glucose (FPG), and fasting insulin (FI) is unknown. It is also unknown whether changes in these glucose metabolism measures vary by socioeconomic position (SEP). We analyzed morning fasting data on 22,492 men and non-pregnant women aged ≥20 years without any diabetes from the National Health and Nutrition Examination Survey 1988 through 2016. Family income to poverty ratio (IPR) and education level were used as measures of SEP (Table). We adjusted all estimates for age, sex, and race/ethnicity accounting for the sampling design using linear/quantile regression. There were significant increases in mean levels of A1C (annual percentage change: 0.1%) and FI (1.8%) from 1988-1994 to 2011-2016 (all p