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. 2022 May 12;9(1):e000631. doi: 10.1136/lupus-2021-000631

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) 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, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Distribution of renal activity index for lupus (RAIL) (A) and RAIL standardised for urine creatinine (RAIL-Cr) (B) scores in relation to SLE disease activity index (rSLEDAI) scores from 246 samples from patients collected >3 months before/after kidney biopsy. Box-Whisker plots of RAIL score (y-axis, A) or RAIL-Cr (y-axis, B) by rSLEDAI (x-axis) in patients with lupus nephritis (LN) (red colour) and no-LN (blue colour), where medians, IQR, maximum, minimum and outliers are shown. The number of urine samples (N%) for each box is outlined above the x-axis along with the percentage out of a total of 151 LN samples and 95 no-LN samples. Based on data in figure 3, the grey dash lines indicate the RAIL scores corresponding to NIH-AI of 2 and 10.