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- Title
An Observational Study of the Equivalence of Age and Duration of Diabetes to Glycemic Control Relative to the Risk of Complications in the Combined Cohorts of the DCCT/EDIC Study.
- Authors
Bebu, Ionut; Braffett, Barbara H.; Schade, David; Sivitz, William; Malone, John I.; Pop-Busui, Rodica; Lorenzi, Gayle M.; Lee, Pearl; Trapani, Victoria R.; Wallia, Amisha; Herman, William H.; Lachin, John M.; DCCT/EDIC Research Group
- Abstract
<bold>Objective: </bold>This epidemiological analysis of the pooled Diabetes Control and Complications Trial/Epidemiology of Diabetes Interventions and Complications (DCCT/EDIC) cohort describes the equivalence of a 1-percentage point increase in HbA1c (such as from 7% to 8%) and years of additional age or duration of type 1 diabetes (T1D) relative to the risk of complications.<bold>Research Design and Methods: </bold>Separate Cox proportional hazards models determined the number of additional years of age and/or duration of T1D that would result in the same increase in risk of microvascular (retinopathy, nephropathy, and neuropathy) and cardiovascular complications and mortality as a 1-percentage point increase in HbA1c.<bold>Results: </bold>The risk of any cardiovascular disease associated with a 1-percentage point increase in HbA1c was equivalent to the risk associated with 4.3 (95% CI 2.7-5.9) additional years of age or 5.6 (95% CI 2.7-6.5) additional years' duration of T1D. The risk of estimated glomerular filtration rate <60 mL/min/1.73 m2 and/or end-stage renal disease associated with a 1-percentage point increase in HbA1c was equivalent to the risk associated with 12.1 (95% CI 8.3-15.9) additional years of age or 18.0 (95% CI 4.3-31.7) additional years' duration of T1D. The proliferative diabetic retinopathy risk associated with a 1-percentage point increase in HbA1c was equivalent to the risk associated with 6.4 (95% CI 5.3-7.4) additional years' duration of T1D, while for mortality risk, it was equivalent to the risk associated with 12.9 (95% CI 6.6-19.3) additional years of age.<bold>Conclusions: </bold>Our results help evaluate the impact of glycemia on advanced complications in a way that may be more interpretable to health care providers and individuals with T1D.
- Subjects
GLYCEMIC control; MEDICAL personnel; PROPORTIONAL hazards models; DIABETES complications; INSULIN pumps; RESEARCH funding
- Publication
Diabetes Care, 2020, Vol 43, Issue 10, p2478
- ISSN
0149-5992
- Publication type
journal article
- DOI
10.2337/dc20-0226