Fig. 3

Scatter plots and adjusted restricted cubic splines illustrating relationship of baseline high sensitivity C-reactive protein (hsCRP) and interleukin-6 (IL-6) with baseline ESA responsiveness index (ERI) in maintenance hemodialysis patients. Panel a hsCRP; b IL-6. 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