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A randomized comparison of the terms estimated average glucose versus hemoglobin A1C
Jessica C Brick1, Rachel L Derr1, Christopher D Saudek1
1Johns Hopkins University School of Medicine, Division of Endocrinology, Baltimore, Maryland, USA.
The Diabetes Educator
|July 28, 2009
Summary
Using estimated average glucose (eAG) or hemoglobin A1C (A1C) to educate diabetes patients resulted in equal knowledge retention. Neither term proved superior for improving patient understanding of glycemic control in this study.
Area of Science:
- Diabetes management and patient education.
- Endocrinology and metabolic diseases.
Background:
- Hemoglobin A1C (A1C) is a key metric for diabetes control.
- Patient understanding of A1C impacts adherence and outcomes.
- Estimated average glucose (eAG) is an alternative way to express A1C values.
Purpose of the Study:
- To compare the effectiveness of using estimated average glucose (eAG) versus hemoglobin A1C (A1C) in patient education.
- To test the hypothesis that eAG improves knowledge retention more than A1C.
- To assess patient understanding of glycemic control after education using either term.
Main Methods:
- Randomized study of diabetes patients with poor baseline A1C understanding.
- Two groups received education on glycemic control using either A1C or eAG.
- Knowledge assessment via telephone survey 3-4 weeks post-intervention.
Main Results:
- Both A1C and eAG education groups showed significant improvement in glycemic control knowledge.
- Mean composite scores increased by 32% in the A1C group and 33% in the eAG group.
- No significant difference in knowledge improvement was observed between the A1C and eAG groups.
Conclusions:
- For patients unfamiliar with A1C, both terms led to similar knowledge gains.
- eAG did not demonstrate superior understandability or memorability compared to A1C in this cohort.
- Further research is warranted to determine if replacing A1C with eAG in patient communication is beneficial.
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