Fig. 2

Scatter plots and adjusted restricted cubic splines illustrating relationship of baseline F2-isoprostanes and isofurans with baseline ESA responsiveness index (ERI) in maintenance hemodialysis patients. Panel a F2-isoprostanes; b Isofurans. Shaded area represents 95 % confidence interval. P-value from multivariable linear regression comparison of quartile 4 to quartile 1, adjustment covariates as per regression model 3