Abstract
To compare impact of incident diabetes on atherosclerotic cardiovascular disease (ASCVD) risk among postmenopausal women according to statin use. Prospective data from 120,499 postmenopausal women without prevalent diabetes or cardiovascular disease at baseline from the Women’s Health Initiative were used. Incident diabetes was self-reported annually and defined as treatment with pills or injectable medication for diabetes. Current statin use was determined at enrollment and years 1, 3, 6, 9 and 13.5 in the three clinical trial arms, and at baseline, year 3, and 13.5 for the observational study. The primary outcome was incident ASCVD events, self-reported annually and adjudicated by blinded local and central physicians. Incident diabetes and statin use status were fitted as time-varying covariates in Cox regression models to assess ASCVD risk during an average follow-up of 13.6 years. For those not on statins at the time of diabetes diagnosis, there was a 42 % increased risk of ASCVD [hazard ratio (HR) 1.42, 95 % CI 1.28–1.58] among women with incident diabetes versus those without diabetes. Among women on statins, there was a 39 % increased risk of ASCVD (HR 1.39, 95 % CI 1.12–1.74) in women with incident diabetes versus those without diabetes. The increased ASCVD risk due to diabetes was similar between women before or after initiating statins (P = 0.89). Whether diabetes was diagnosed before or after statin use did not alter the increased risk of ASCVD associated with diabetes. Mitigating the increased incidence of diabetes in statin users could increase the ASCVD benefit-to-risk ratio of statins.
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Acknowledgments
Y.M. and G.M.P wrote the manuscript and researched data. A.L.C., J.E.M., L.S.P., S.L., C.E., M.L., L.W.M, B.V.H, R.B., C.E.B., I.S.O., S.R.S., J.K.O., L.T, R.N., and J.R. contributed to the discussion and reviewed and edited the manuscript. C.A. and K. H performed data analyses and reviewed and edited the manuscript. The Women’s Health Initiative (WHI) program is funded by the National Heart, Lung, and Blood Institute, National Institutes of Health, US Department of Health and Human Services through contracts N01WH22110, 24152, 32100-2, 32105-6, 32108-9, 32111-13, 32115, 32118-32119, 32122, 42107-26, 42129-32, and 44221. Our investigation also was supported in part by 5R01HL122241-02. A list of WHI investigators is available in Supplementary Data online. The authors thank the principal investigators of all WHI clinical centers and the data coordinating center for their contribution to the study. They are also indebted to the dedicated and committed participants of the WHI.
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Appendix
Appendix
See Tables 3, 4, 5, 6, 7 and 8.
Post hoc test of comparisons
Comparison | Wald Chi-square | df | P value |
---|---|---|---|
Across 3 diabetes groups | 3.4597 | 2 | 0.177 |
Pairwise tests | |||
Diabetes before statin (if any) and diabetes after statin (low potency) | 1.9568 | 1 | 0.162 |
Diabetes before statin (if any)and diabetes after statin (high potency) | 1.2013 | 1 | 0.273 |
Diabetes after statin (low potency) and diabetes after statin (high potency) | 3.4592 | 1 | 0.063 |
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Ma, Y., Persuitte, G.M., Andrews, C. et al. Impact of incident diabetes on atherosclerotic cardiovascular disease according to statin use history among postmenopausal women. Eur J Epidemiol 31, 747–761 (2016). https://doi.org/10.1007/s10654-016-0153-7
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DOI: https://doi.org/10.1007/s10654-016-0153-7