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Table 1 Demographic Characteristics of the Study Population (n = 107)

From: Quantity and quality of retrograde menstruation: a case control study

  Endometriosis (n = 59) Controls (n = 48)
Age (years, mean ± SD) 31.76 ± 3.71 28.27 ± 3.18
Duration of infertility (years, mean ± SD) 2.67 ± 2.06 2.13 ± 1.12
Primary/secondary infertility [n(%)] 39(66.1)/20(33.9) 30(62.5)/18(37.5)
Concurrent medication [n(%)] 2(3.38) 0
Phase of the menstrual cycle [n(%)]   
Menstrual 18(78.26) 5(21.74)
Nonmenstrual total 38(45.23) 46(54.77)
Follicular 22(26.19) 16(19.04)
Luteal 16(19.04) 30(35.73)
Indication for surgery [n(%)]   
Infertility 58(98.3) 45(93.75)
Pelvic pain 1(1.71) 3(6.25)