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. 2014 Aug 26;66(9):1296–1301. doi: 10.1002/acr.22296

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© 2014 The Authors. Arthritis Care & Research is published by Wiley Periodicals, Inc. on behalf of the American College of Rheumatology.

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Observed and expected mortality rates by calendar year for all-cause (A) and cardiovascular (CV)–specific (B) mortality. Observed rates were modeled using Poisson regression with natural splines and expected rates were calculated from mortality rates for Norfolk, age and sex standardized to the study population. The y-axes show rates per 1,000 person-years and 95% confidence intervals (95% CIs). NOAR = Norfolk Arthritis Register.