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Table 1 Baseline characteristics according to endometrial thickness at trigger day

From: Association between endometrial thickness and neonatal outcomes in intrauterine insemination cycles: a retrospective analysis of 1,016 live-born singletons

 ≤7.6 mm
(n = 109)
7.7–13.0 mm
(n = 798)
≥13.1 mm
(n = 109)
P-value
Maternal age (years)30.7 ± 3.730.2 ± 3.730.0 ± 3.30.313
Maternal BMI (kg/m2)21.76 ± 2.5622.34 ± 3.3522.13 ± 2.870.401
Paternal age (years)32.9 ± 5.432.1 ± 4.432.1 ± 4.90.465
Paternal BMI (kg/m2)25.09 ± 2.9524.50 ± 3.0824.35 ± 3.210.224
Nulligravida, n (%)53 (48.6)551 (69.0)90 (82.6)< 0.001
Nulliparity, n (%)101 (92.7)761 (95.4)103 (94.5)0.465
Duration of infertility (years)2.8 ± 1.82.9 ± 2.03.0 ± 2.20.828
Infertility diagnosis, n (%)   0.610
 Anovulation19 (17.4)143 (17.9)16 (14.7) 
 Male factor21 (19.3)192 (24.1)28 (25.7) 
 Endometriosis0 (0)18 (2.3)3 (2.8) 
  Mixed3 (2.8)26 (3.3)5 (4.6) 
 Unexplained66 (60.6)419 (52.5)57 (52.3) 
Rank of IUI attempts, n (%)   0.652
 1st cycle70 (64.2)485 (60.8)61 (56.0) 
 2nd cycle30 (27.5)246 (30.8)35 (32.1) 
 3rd or more9 (8.3)67 (8.4)13 (11.9) 
Stimulation protocol, n (%)   0.661
 LE13 (11.9)79 (9.9)9 (8.3) 
 LE + hMG96 (88.1)719 (90.1)100 (91.7) 
Length of treatment (days)10.3 ± 2.011.5 ± 2.912.5 ± 2.7< 0.001
Peak E2 level (pg/mL)256.6 ± 197.9287.9 ± 205.8346.3 ± 248.7< 0.001
Endometrial thickness (mm)6.60 ± 0.9610.06 ± 1.4314.42 ± 1.27< 0.001
Postprocessing TMSC (millions)27.8 ± 27.432.6 ± 37.433.2 ± 33.80.430
Vanishing twin syndrome, n (%)4 (3.7)15 (1.9)2 (1.8)0.469
Pregnancy complications, n (%)7 (6.4)60 (7.5)9 (8.3)0.875
Year of treatment   0.131
 2008–20116 (5.5)72 (9.0)14 (12.8) 
 2012–201539 (35.8)345 (43.2)43 (39.4) 
 2016–201864 (58.7)381 (47.7)52 (47.7) 
  1. Data are presented as mean ± standard deviation or number (percentage).
  2. BMI body mass index, IUI intrauterine insemination, LE letrozole, hMG human menopausal gonadotropin, E2 estradiol, TMSC total motile sperm count