Fig. 2.

The regression models show significant relations between CX3CL1 serum level and clinical and biochemical parameters in Group 2 (preeclampsia). In Group 1 (control), the analysis did not reveal any significant correlation between CX3CL1 level and examined parameters (not shown on the figure). In the upper right corner of each graph, p values are shown. Solid line represents a regression curve, grey zones represent 95% confidence intervals. Based on the regression models, the beta coefficient (slope) between CX3CL1 serum level and birth weight was − 0.31 (p = 0.015) (a), for cerebro-placental ratio (CPR) the beta coefficient was − 0.27 (p = 0.031) (b) and for sFlt-1/PlGF ratio the beta coefficient was 3.02 (p = 0.024) (c). The criterions of the accuracy of the approximation r² were 0.25, 0.24 and 0.18, respectively