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. 2017 Jun 6;7(5):e014821. doi: 10.1136/bmjopen-2016-014821

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Scatter plot of chromium levels versus estimated glomerular filtration rate (eGFR). Chromium levels (μg/L) were not normally distributed. The non-linear regression line (one-phase exponential decay) has been included. Glomerular filtration rate was measured in mL/min/1.73 m². The formula reads: Y=(Y0−Plateau)×exp(−K×x)+Plateau, where Y0 is the value when x is 0, Plateau is Y at a large value, K is the rate constant, and the values were Y0=1.641, Plateau=0.4841 and K=0.09060 (GraphPad Prism).