an increasing trendP < 0.001
The ELISA found that the concentrations of M1-related factors in the hematoma fluid significantly differed among the homogeneous type, laminar type, separated type, and trabecular type, exhibiting an increasing trend ( P < 0.001, Fig. 2 D), while the concentrations of M2-related factors showed the decreasing trend ( P < 0.001, Fig. 2 E).