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Table 1 Baseline characteristics of patients among groups A–E stratified by age

From: Live birth rate and neonatal outcomes of different quantities and qualities of frozen transferred blastocyst in patients requiring whole embryo freezing stratified by age

  <35 years of age ≥ 35 years of age
Group A Group B Group C Group D Group E P Group A Group B Group C Group D Group E P
Cycles (n) 1425 844 206 183 120   144 269 107 39 25  
female age(year) 29.17 ± 2.89 29.32 ± 2.92 29.45 ± 2.93 29.50 ± 2.69 29.38 ± 3.62 0.419 36.65 ± 1.91 37.17 ± 2.01 37.16 ± 1.93 37.51 ± 2.53 37.08 ± 2.57 0.063
BMI (kg/m2) 21.46 ± 3.09 21.70 ± 3.20 21.34 ± 3.13 21.71 ± 3.48 21.67 ± 3.41 0.343 21.96 ± 2.75 22.59 ± 2.82 22.59 ± 2.88 22.38 ± 2.45 22.06 ± 2.41 0.210
Basal FSH (mIU/ml) 5.08 ± 1.24 4.92 ± 1.25 5.07 ± 1.37 4.96 ± 1.21 5.16 ± 1.44 0.104 5.15 ± 1.63 5.15 ± 1.31 4.81 ± 1.22 5.15 ± 1.66 5.11 ± 0.91 0.701
AMH (ng/ml) 8.06 ± 5.71 7.80 ± 4.03 7.22 ± 3.68 6.85 ± 3.72 6.98 ± 3.80 0.095 6.08 ± 3.56 6.34 ± 3.75 5.08 ± 2.25 5.74 ± 3.86 5.80 ± 3.07 0.347
Duration of infertility (years) 3.44 ± 1.94 3.57 ± 2.06 3.85 ± 2.08 3.53 ± 1.94 3.33 ± 1.89 0.052 4.21 ± 3.39 5.08 ± 3.92 5.06 ± 3.96 5.81 ± 4.17 4.72 ± 3.02 0.099
Type of infertility       0.276       0.522
 Primary infertility 56.14
(800/1425)
52.25
(441/844)
56.31
(116/206)
55.19
(101/183)
60.83
(73/120)
  27.08
(39/144)
33.09
(89/269)
25.23
(27/107)
33.33
(13/39)
28.0
(7/25)
 
 Secondary infertility 43.86
(625/1425)
47.75
(403/844)
43.69
(90/206)
44.81
(82/183)
39.17
(47/120)
  72.92
(105/144)
66.91
(180/269)
74.77
(80/107)
66.67
(26/39)
72.0
(18/25)
 
Endometrial preparation (%)       0.669       0.149
 HRT 84.0
(1197/1425)
86.26
(728/844)
85.44
(176/206)
84.70
(155/183)
83.33
(100/120)
  70.83
(102/144)
76.95
(207/269)
82.24
(88/107)
79.49
(31/39)
64.0
(16/25)
 
 Natural 16.0
(228/1425)
13.74
(116/844)
14.56
(30/206)
15.30
(28/183)
16.67
(20/120)
  29.17
(42/144)
23.05
(62/269)
17.76
(19/107)
20.51
(8/39)
36.0
(9/25)
 
 Endometrial thickness (mm) 9.04 ± 1.61 8.67 ± 1.58 8.85 ± 1.53 8.93 ± 1.60 8.99 ± 1.56 0.106 8.98 ± 1.83 8.89 ± 1.61 8.96 ± 1.63 8.86 ± 1.73 9.13 ± 1.52 0.939
  1. BMI body mass index, FSH follicle-stimulating hormone, AMH anti-mullerian hormone, HRT hormone replacement therapy
  2. group A, one good-quality blastocyst; group B, two good-quality blastocysts; group C, one good- and one average-quality blastocyst; group D, two average-quality blastocysts, group E, one average-quality blastocyst