U.S. Department of Health and Human Services Office of Disease Prevention and Health Promotion

Reduce the proportion of adults with diabetes who have an A1c value above 9 percent — D‑03 Data Methodology and Measurement

On this page:  About the National Data  |  Methodology  |  History

About the National Data

Data

Data Source:  National Health and Nutrition Examination Survey (NHANES), CDC/NCHS

Baseline: 18.7 percent of adults aged 18 years and over with diagnosed diabetes had an A1c value greater than 9.0 percent in 2013-16

Target: 11.6 percent

Numerator
Number of adults aged 18 years and over with doctor diagnosed diabetes and with HbA1c values greater than 9 percent.
Denominator
Number of adults aged 18 years and over who report that they have ever been diagnosed with diabetes.
Target-setting method

Percentage point improvement

Target-setting method details
Percentage point improvement from the baseline using Cohen's h effect size of 0.20.
1
Target-setting method justification
Trend data were evaluated for this objective but it was not possible to project a target because the trend was moving away from the desired direction. A percentage point improvement was calculated using Cohen's h effect size of 0.2. This method was used because it was a statistically significant improvement from the baseline.

Methodology

Methodology notes

Persons are considered to have diagnosed diabetes if they respond 'yes' to ever being told by a doctor or health professional that they have diabetes or sugar diabetes. Those who respond borderline are counted as 'no'. Women who report that the only time they have been diagnosed with diabetes was during pregnancy (gestational diabetes) are excluded. Women who are pregnant at the time of the exam are also excluded. Age adjustment groups: Total: 18-49, 50-59, 60-69, 70-79, 80+.

History

Comparable HP2020 objective
Retained, which includes core objectives that are continuing from Healthy People 2020 with no change in measurement.
Trend issues

The definitions of poor glycemic control can vary for individuals based on factors such as age, co-morbidities, symptomatic history, or social circumstances.

1. Effect size h=0.2 was chosen to correspond with 20% improvement from a baseline of 50%.

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