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. 2014 Oct 24;2(1):e000027. doi: 10.1136/bmjdrc-2014-000027

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 3.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/3.0/

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Graphs of residual C peptide with severity of diabetic retinopathy analyzed categorically (top) and quantitatively (bottom). Residual C peptide corrected only for renal function (creatinine; A and C) and corrected for covariates in model 4 (B and D) is shown. DM, diabetes mellitus; DR, diabetic retinopathy; NPDR, non-proliferative diabetic retinopathy; PDR, proliferative diabetic retinopathy; ETDRS, Early Treatment Diabetic Retinopathy Study.