HbA1c variability is associated with increased mortality and earlier hospital admission in people with Type 1 diabetes

Walker, G.S., Cunningham, S.G., Sainsbury, C.A.R. and Jones, G.C. (2017) HbA1c variability is associated with increased mortality and earlier hospital admission in people with Type 1 diabetes. Diabetic Medicine, 34(11), pp. 1541-1545. (doi: 10.1111/dme.13455) (PMID:28833535)

Abstract

Aim: Despite evidence of morbidity, no evidence exists on the relationship between HbA1c variability and mortality in Type 1 diabetes. We performed an observational study to investigate whether the association between HbA1c variability and mortality exists in a population of people with Type 1 diabetes. As a secondary outcome, we compared onset of first hospital admission between groups. Methods: People with Type 1 diabetes were identified for inclusion from the Scottish Care Information – Diabetes data set. This database includes data of all people known to have diabetes who live within Scotland. A survival analysis was carried out over a 47‐month period comparing two groups; group 1 with a HbA1c coefficient of variation (CV) above the median CV value, and group 2 with a CV below the median value. Time to death or first admission was also analysed. A Cox proportional hazard model was used to compare time to death, adjusting for appropriate covariables. Results: Some 6048 individuals with Type 1 diabetes were included in the analysis. Median HbA1c CV was 7.9. The hazard ratio (HR) for mortality for those with an HbA1c CV above the median value is 1.5 over 47 months of follow‐up (P < 0.001). HR for survival to either the first admission to hospital or death for those with an HbA1c CV above the median value was 1.35 (95% confidence interval 1.25–1.45) over 730 days of follow‐up (P < 0.001). Conclusion: Our results show that people with greater HbA1c variability have a higher rate of mortality and earlier hospital admission in Type 1 diabetes.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Sainsbury, Dr Christoper and Jones, Dr Gregory and Walker, Dr Graham
• Authors: Walker, G.S., Cunningham, S.G., Sainsbury, C.A.R., and Jones, G.C.
• College/School: College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing
• Journal Name: Diabetic Medicine
• Publisher: Wiley
• ISSN: 0742-3071
• ISSN (Online): 1464-5491
• Published Online: 19 August 2017
• Copyright Holders: Copyright © 2017 Diabetes UK
• First Published: First published in Diabetic Medicine 34(11):1541-1545
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher