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Table 1 The cases of the endometriosis group and the control group in different phase of menstrual cycle (n)

From: DNA hypomethylation of the COX-2 gene promoter is associated with up-regulation of its mRNA expression in eutopic endometrium of endometriosis

Phase of menstrual cycle EMs group Control group χ 2 P
Early secretory 20 7 0.032 0.984
Mid secretory 27 9   
Late secretory 13 4