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. 2015 Jun 1;10(6):e0129159. doi: 10.1371/journal.pone.0129159

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© 2015 Nagata et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 1 — G1: GFR ≥ 90 ml/min/1.73m², G2: GFR = 60 to 90 ml/min/1.73m², G3: GFR = 30 to 60 ml/min/1.73m², G4: GFR = 15 to 30 ml/min/1.73m², G5: GFR ≤ 15 ml/min/1.73m², HD: hemodialysis. **P <0.01 compared to any other GFR category. ††P <0.01 compared to G3 and G2+G1. ¶¶P <0.01 compared to G1+G2. §P <0.05 compared to G3.