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Table 1 Baseline characteristics of all FET cycles

From: Effects of pre-pregnancy body mass index on pregnancy and perinatal outcomes in women with PCOS undergoing frozen embryo transfer

CharacteristicNormal(N = 972)Overweight(N = 480)Obesity(N = 228)Normal vs. OverweightOverweight vs. ObestiyNormal vs. Obesity
Age of embryo transfer (years), mean (SD),32.82 ± 3.4033.09 ± 3.8133.27 ± 3.610.1520.5420.076
Duration of infertility (years), mean (SD)3.80 ± 2.394.02 ± 2.804.21 ± 3.040.1140.4120.058
BMI of women, mean (SD)21.45 ± 1.7226.93 ± 2.2132.13 ± 1.89< 0.0001< 0.0001< 0.0001
Antral follicle count, mean (SD)18.48 ± 6.2318.85 ± 6.9617.78 ± 8.010.3060.0690.218
Infertility causes, n (%)0.0750.9680.727
 PCOS only266 (27.38%)123 (25.72%)59 (25.99%)   
 PCOS + male factor120 (12.32%)55 (11.45%)28 (12.19%)   
 PCOS + tubal factor486 (49.97%)242 (50.34%)115 (50.62%)   
 PCOS + male factor + tubal factor74 (7.69%)33 (6.93%)16 (7.21%)   
 PCOS + other factor26 (2.64%)27 (5.56%)10 (3.99%)   
Basal FSH (mIU/mL), median (min-max)5.21 (0.32–9.98)4.94 (0.26–9.99)4.61 (0.45–9.99)< 0.00010.0310.002
Basal LH (mIU/mL),median (min-max)5.36 (0.19–18.92)4.57 (0.16–17.29)4.02 (0.28–18.49)< 0.00010.031< 0.0001
Basal E2 (pg/mL),median (min-max)36.00 (10.00–84.00)37.00 (10.00–90.00)37.00 (10.00–88.00)0.5460.9290.618
Basal P (ng/mL),median (min-max)0.30 (0.10–0.80)0.30 (0.10–0.90)0.30 (0.10–0.90)< 0.00010.032< 0.0001
Previous IVF failures n (%)   0.1770.9410.585
 0693 (71.28%)361 (75.17%)169 (73.96%)   
 1–2207 (21.28%)94 (19.52%)46 (19.99%)   
  ≥ 372 (7.44%)25 (5.31%)13 (6.05%)   
Type of infertility, n (%)0.1550.1630.754   
 Primary652 (67.04%)335 (69.72%)156 (68.23%)   
 Secondary320 (32.96%)145 (30.28%)72 (31.77%)   
Type of FET cycle0.1120.0730.062   
 HRT399 (41.07%)217 (45.16%)107 (46.93%)   
 Ovarian stimulation573 (58.93%)263 (54.84%)121 (53.07%)   
Endometrial thickness [17]11.28 ± 2.0211.32 ± 2.0511.29 ± 1.980.5320.3290.835
Fertilization method,n (%)   0.5230.8220.894
 IVF562 (57.85%)287 (59.71%)131 (57.29%)   
 ICSI222 (22.82%)97 (20.27%)50 (21.96%)   
 Half IVF + half ICSI188 (19.33%)96 (20.02%)47 (20.75%)   
  1. PCOS Polycystic ovary syndrome, HRT hormone replacement therapy, ICSI Intracytoplasmic sperm injection, FSH follicle-stimulating hormone, LH luteinizing hormone, E2 estradiol; P progestogen. All P values were assessed using χ2 or ANOVA
  2. P <0.05 was considered to be statistically significant