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Table 1 Demographic characteristics of participants

From: Decreased MUC1 in endometrium is an independent receptivity marker in recurrent implantation failure during implantation window

Variables Control (N = 20) RIF (N = 14) RM (N = 25) P-valuea
Age (y) 28.9 ± 3.0 35.2 ± 3.3 36.1 ± 3.2 < 0.001
BMI (kg/m2) 21.7 ± 1.9 21.9 ± 2.4 22.9 ± 3.9 0.43
Smoking (n) 0/20 (0%) 0/14 (0%) 3/25 (12.0%) 0.12a
Cycle length (d) 29.4 ± 1.7 29.1 ± 2.0 29.8 ± 4.8 0.89
Abnormal karyotype (n) 0/20 (0%) 0/14 (0%) 0/25 (0%) NAa
Progesterone level (nmol/L) 62.4 ± 33.5 47.3 ± 20.9 0.31b
No. of previous pregnancy
 0 0/20 (0%) 10/14 (71.4%) 0/25 (0%) < 0.001
 1 12/20 (60.0%) 3/14 (21.4%) 0/25 (0%) < 0.001
  ≥ 2 8/20 (40.0%) 1/14 (7.1%) 25/25 (100%) < 0.001
No. of live birth
 0 0/20 (0%) 13/14 (92.9%) 23/25 (92.0%) < 0.001
 1 14/20 (70.0%) 1/14 (7.1%) 2/25 (8.0%) < 0.001
  ≥ 2 6/20 (30.0%) 0/14 (0%) 0/25 (0%) < 0.001
No. of previous miscarriage
 0 20/20 (100%) 10/14 (71.4%) 0/25 (0%) < 0.001
 1 0/20 (0%) 3/14 (21.4%) 0/25 (0%) < 0.001
 2 0/20 (0%) 1/14 (7.1%) 0/25(0%) < 0.001
  ≥ 3 0/20 (0%) 0/14 (0%) 25/25 (100%) < 0.001
  1. Data are presented as mean ± SD or n/N (%). RIF, recurrent implantation failure; RM, recurrent miscarriage. aChi square test compared among 3 groups when indicated; b Mann-Whitney test compared between RIF and RM groups only; NA: not available