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Table 1 Baseline characteristics of the two groups

From: Risk of miscarriage in women with endometriosis undergoing IVF fresh cycles: a retrospective cohort study

Characteristics Endometriosis n = 1006 Controls n = 2012 OR (95% CI) P value
Female’s Age (years) 33.04 ± 3.66 32.83 ± 3.76 0.16
Male’s Age (years) 34.75 ± 4.72 34.40 ± 4.85 0.06
BMI (kg/m2) 21.94 ± 3.12 22.44 ± 3.20 < 0.001
Gravidity [n (%)]
 None 669 (66.5) 968 (48.1) 2.141 (1.829–2.506) < 0.001
 1 206 (20.5) 501 (24.9)   
 2 85 (8.4) 319 (15.9)   
  ≥ 3 46 (4.6) 224 (11.1)   
 Duration of infertility (years) 4.77 ± 3.38 4.98 ± 3.54 0.13
Parity [n (%)]
 None 965 (95.9) 1805 (89.7) 2.699 (1.913–3.808) < 0.001
 1 41 (4.1) 187 (9.3)   
 2 0 (0) 20 (1.0)   
 Day 3 serum FSH (IU/ml) 7.10 ± 3.64 6.98 ± 2.75 0.39
Indication to IVF
 Endometriosis 719 (71.47)    
 Endometriosis +Tubal factor 287 (28.53)    
 Male factor   256 (12.72)   
 Tubal factor   1583 (78.68)   
 Mixed (without endometriosis)   173 (8.60)   
Regimen of ovarian hyper-stimulation
 Long protocol 719 (71.5) 1244 (61.8) 1.547 (1.313–1.822) < 0.001
 Flare-up protocol 95 (9.4) 434 (21.6)   
 GnRH antagonists 186 (18.5) 328 (16.3)   
 Other 6 (0.6) 6 (0.3)   
 Duration of stimulation (days) 11.72 ± 2.53 11.36 ± 2.44 < 0.001
 Total dose of FSH administered (IU) 3467.85 ± 1448.45 2850.55 ± 1267.95 < 0.001
 Estradiol at the time of hCG administration (pg/ml) 2247.77 ± 1601.71 2823.35 ± 1882.31 < 0.001
 Total oocytes retrieved 10.07 ± 5.64 12.36 ± 6.02 < 0.001
Stage at embryo transfer
 72 h 977 (97.1) 1972 (98.0) 0.683 (0.421–1.109) 0.12
 Blastocysts 29 (2.9) 40 (2.0)   
 Miscarriage 225 (22.4) 405 (20.1) 1.143 (0.951–1.374) 0.09
  1. Data are expressed as Mean + 1 SD or number (percentage) as appropriate
  2. Data are compared using unpaired Student’s t test or Fisher’s exact test