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Table 1 General characteristics of the study participants

From: The influence of menstrual cycle and endometriosis on endometrial methylome

Microarray study Patients with endometriosis (n = 31) Disease-free women (n = 24)
  Estonian patients Oxford patients Estonian controls Oxford controls
(n = 24) (n = 7) (n = 17) (n = 7)
 Age (years ± SD) 31.0 ± 4.0 36.0 ± 5.0 30.1 ± 3.2 34.2 ± 6.2
 BMI (mean, kg/m2 ± SD) 21.8 ± 3.1 23.6 ± 2.0 23.6 ± 4.2 26.0 ± 4.3
 Smoking (n) 0 2 0 0
 Stage I–II (n) 16 3 NA NA
 Stage III–IV (n) 8 4 NA NA
 Only endometrioma (n) 0 4 NA NA
 Only peritoneal lesions (n) 14 3 NA NA
 Peritoneal lesions together with endometrioma (n) 10 0 NA NA
Menstrual cycle characteristics
 Menstrual phase (days 1–5), (n) 0 4 0 1
 Proliferative phase (days 6–14), (n) 0 2 0 3
 Early-secretory phase (days 15–20),(n) 7 0 0 1
 Mid-secretory phase (days 21–23), (n) 8 1 17 0
 Late-secretory phase (days 24–28), (n) 9 0 0 2
Validation study Patients with endometriosis (n = 15) Disease-free women (n = 14)
 Age (years ± SD) 31.0 ± 3.39   32.0 ± 2.7  
 BMI (mean, kg/m2 ± SD) 20.0 ± 3.92   23.1 ± 5.73  
 Smoking (n) 1   2  
 Mid-secretory phase (days 21–23), (n) 7   7  
 Late-secretory phase (days 24–28), (n) 8   7  
 Stage I–II (n) 13   NA  
 Stage III–IV (n) 2   NA  
  1. NA not applicable