Giovanni Corrao1, Buthaina Ibrahim2, Federica Nicotra2, Davide Soranna2, Luca Merlino3, Alberico L Catapano4, Elena Tragni5, Manuela Casula5, Guido Grassi6, Giuseppe Mancia7. 1. Department of Statistics and Quantitative Methods, Division of Biostatistics, Epidemiology and Public Health, University of Milano-Bicocca, Milan, Italy giovanni.corrao@unimib.it. 2. Department of Statistics and Quantitative Methods, Division of Biostatistics, Epidemiology and Public Health, University of Milano-Bicocca, Milan, Italy. 3. Operative Unit of Territorial Health Services, Region Lombardia, Milan, Italy. 4. Department of Pharmacological and Biomolecular Sciences, Centre of Epidemiology and Preventive Pharmacology (SEFAP), University of Milano, Milan, ItalyIRCCS Multimedica, Sesto San Giovanni, Milan, Italy. 5. Department of Pharmacological and Biomolecular Sciences, Centre of Epidemiology and Preventive Pharmacology (SEFAP), University of Milano, Milan, Italy. 6. IRCCS Multimedica, Sesto San Giovanni, Milan, ItalyDepartment of Health Science, University of Milano-Bicocca, Milan, Italy. 7. Department of Health Science, University of Milano-Bicocca, Milan, ItalyIRCCS Istituto Auxologico Italiano, Milan, Italy.
Abstract
OBJECTIVE: To investigate the relationship between adherence with statin therapy and the risk of developing diabetes. RESEARCH DESIGN AND METHODS: The cohort comprised 115,709 residents of the Italian Lombardy region who were newly treated with statins during 2003 and 2004. Patients were followed from the index prescription until 2010. During this period, patients who began therapy with an antidiabetic agent or were hospitalized for a main diagnosis of type 2 diabetes were identified (outcome). Adherence was measured by the proportion of days covered (PDC) with statins (exposure). A proportional hazards model was fitted to estimate hazard ratios (HRs) and 95% CIs for the exposure-outcome association, after adjusting for several covariates. A set of sensitivity analyses was performed to account for sources of systematic uncertainty. RESULTS: During follow-up, 11,154 cohort members experienced the outcome. Compared with patients with very-low adherence (PDC <25%), those with low (26-50%), intermediate (51-75%), and high (≥75%) adherence to statin therapy had HRs (95% CIs) of 1.12 (1.06-1.18), 1.22 (1.14-1.27), and 1.32 (1.26-1.39), respectively. CONCLUSIONS: In a real-world setting, the risk of new-onset diabetes rises as adherence with statin therapy increases. Benefits of statins in reducing cardiovascular events clearly overwhelm the diabetes risk.
OBJECTIVE: To investigate the relationship between adherence with statin therapy and the risk of developing diabetes. RESEARCH DESIGN AND METHODS: The cohort comprised 115,709 residents of the Italian Lombardy region who were newly treated with statins during 2003 and 2004. Patients were followed from the index prescription until 2010. During this period, patients who began therapy with an antidiabetic agent or were hospitalized for a main diagnosis of type 2 diabetes were identified (outcome). Adherence was measured by the proportion of days covered (PDC) with statins (exposure). A proportional hazards model was fitted to estimate hazard ratios (HRs) and 95% CIs for the exposure-outcome association, after adjusting for several covariates. A set of sensitivity analyses was performed to account for sources of systematic uncertainty. RESULTS: During follow-up, 11,154 cohort members experienced the outcome. Compared with patients with very-low adherence (PDC <25%), those with low (26-50%), intermediate (51-75%), and high (≥75%) adherence to statin therapy had HRs (95% CIs) of 1.12 (1.06-1.18), 1.22 (1.14-1.27), and 1.32 (1.26-1.39), respectively. CONCLUSIONS: In a real-world setting, the risk of new-onset diabetes rises as adherence with statin therapy increases. Benefits of statins in reducing cardiovascular events clearly overwhelm the diabetes risk.
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