Abstract
Aims
We quantified the impact of type 2 diabetes on incidence of non-fatal cardiovascular disease (CVD) and mortality, considering CVD as a continuum from occurrence of diabetes to the end point, and estimated the 15-year life expectancy with and without CVD.
Methods
A total of 7239 Iranian adults (3246 men), aged ≥ 30 years, were followed from 1999 to 2014. We applied a multi-state semi-Markov model with three transitions including CVD-free to non-fatal CVD, CVD-free to death and non-fatal CVD to death, and studied the influence of diabetes on each transition rate, stratifying by sex and adjusting for confounders.
Results
Diabetes was significantly associated with increased risk of non-fatal CVD in men [hazard ratio, 1.70 (1.36–3.53)] and women [2.19 (1.74–2.77)], and of all-cause death [2.72 (2.03–3.63) and 1.92 (1.37–2.67) in men and women, respectively]. An increased risk of mortality was found only among diabetic men, when non-fatal CVD was occurred [2.19 (1.36–3.53)]. Men with diabetes experienced first non-fatal CVD and death without CVD 1.7 and 1.4 years, respectively, earlier than those without diabetes; the corresponding values were 1.4 and 0.7 years for women. Moreover, diabetic men lived 1.3 years less than non-diabetic counterparts when non-fatal CVD was occurred.
Conclusions
Diabetes increased the risk of non-fatal CVD events and all-cause mortality and consequently decreased the number of years lived without CVD. A decrease in LE was found only among diabetic men compared to non-diabetics after non-fatal CVD occurred.
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Acknowledgements
The authors wish to acknowledge Ms Niloofar Shiva for critical editing of English grammar and syntax of the manuscript. The authors also wish to thank Dr Hajime Uno from Harvard Medical School, who introduced the correct methods for estimating the restricted mean survival time.
Funding
This study was supported by Grant No. 121 from the National Research Council of the Islamic Republic of Iran.
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This study was approved by the ethics committee of the Research Institute for Endocrine Sciences of the Shahid Beheshti University of Medical Sciences according to the principles of the Declaration of Helsinki.
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All participants were informed of the study protocol, and their written informed consents were obtained before inclusion.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Managed by Antonio Secchi.
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592_2017_1083_MOESM3_ESM.pdf
Online Resource 3 Stacked probability transition curves for participants with diabetes (A) and without diabetes (B); the distance between two curves represent the probabilities of the different events (PDF 65 kb)
592_2017_1083_MOESM4_ESM.pdf
Online resource 4 Adjusted restricted mean survival time (RMST) of total population; Tehran Lipid and Glucose Study (1999-2014) (PDF 20 kb)
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Ramezankhani, A., Azizi, F., Hadaegh, F. et al. Diabetes and number of years of life lost with and without cardiovascular disease: a multi-state homogeneous semi-Markov model. Acta Diabetol 55, 253–262 (2018). https://doi.org/10.1007/s00592-017-1083-x
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DOI: https://doi.org/10.1007/s00592-017-1083-x