NCAM1 and chronic endometritis: The incidence of chronic endometritis was higher in the high-value CD56 group (≥ 23.5 cells/HPF), and in the high-value CD38 group (≥ 0.5 cells/HPF) (χ<sup>2</sup> = 15.994, χ<sup>2</sup> = 129.067, and both <i>P</i> < 0.001).