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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