Table 1.
Baseline characteristics of patients among groups A–E 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 |
BMI body mass index, FSH follicle-stimulating hormone, AMH anti-mullerian hormone, HRT hormone replacement therapy
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