Relationship between the maternal platelet count at delivery and the infant platelet count at birth. Data are plotted according to maternal platelet count at delivery on the x-axis and infant platelet count at birth on the y-axis. The solid line is the regression line, demonstrating that there was no correlation between the maternal platelet count at delivery and the infant platelet count at birth (Spearman correlation coefficient, 0.02; P = .81). The equation for the regression line is: infant platelet count = 200.0 + (0.10) maternal platelet count. The 95% confidence interval is represented by the dotted line.