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Mean/Median A1c Among Adults with Diagnosed Diabetes, United States, 1988–1994 to 1999–2006

The figure shows the following values of A1c levels among adults with diagnosed diabetes: maximum and minimum (top and bottom of the vertical line), 75th and 25th percentiles (top and bottom ends of the box), mean (average—the plus sign), and median (50th percentile—the line inside the blue box). The mean and median A1c levels were lower in 2003–2006 compared with those in 1988–1994 and in 1999–2002. From 1988–1994 to 2003–2006, the 25th percentile remained stable but the 75th percentile decreased, indicating a drop in A1c levels at the upper end of the distribution.

Mean/Median A1c among Adults with Diagnosed Diabetes, United States, 1988–1994 to 1999–2006

 

YearMinimum25th PercentileMeanMedian75th PercentileMaximum
1988–19942.86.07.77.49.016.2
1999–20024.36.27.67.28.518.8
2003–20063.96.07.26.77.818.0

 

Detailed Tables

 

Methods and Limitations

Data Source: Centers for Disease Control and Prevention, National Center for Health Statistics, data from the National Health and Nutrition Examination Survey. Statistical analysis by the Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Division of Diabetes Translation.

 

 

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