Table 2.
Patient cycle-based success rates stratified by women’s age subgroups
| Total | Group A (age: ≤ 34 years) | Group B (age: 35–37 years) | Group C (age: 38–40 years) | Group D (age: 41–42 years) | Group E (age: ≥ 43 years) | P value | |
|---|---|---|---|---|---|---|---|
| No. of patients received embryo transfer | 754 | 123 | 143 | 258 | 134 | 96 | NA |
| No. of embryo transfer cycles | 1539 | 225 | 268 | 561 | 304 | 181 | |
| Types of transferred embryos, n (%) | |||||||
| Fresh-cleavage stage embryo | 771 (50.1) | 104 (46.2)ab | 113 (42.2)a | 292 (52.1)b | 146 (48.0)ab | 116 (64.1)c | < 0.01 |
| Fresh-blastocyst stage embryo | 8 (0.5) | 3 (1.3) | 3 (1.1) | 2 (0.4) | 0 (0) | 0 (0) | 0.1088 |
| Frozen-cleavage stage embryo | 79 (5.1) | 8 (3.6) | 13 (4.9) | 25 (4.5) | 19 (6.3) | 14 (7.7) | 0.2857 |
| Frozen-blastocyst stage embryo | 681 (44.3) | 110 (48.9)ab | 139 (51.9)a | 242 (43.1)b | 139 (45.7)a | 51 (28.2)c | < 0.01 |
| Endometrial preparation in frozen embryo transfer cycles, n (%) | |||||||
| Spontaneous ovulation cycle | 702 (92.4) | 105 (86.8)a | 154 (96.9)b | 255 (94.8)bc | 144 (89.4)a | 60 (89.6)ac | 0.0048 |
| Hormone replacement cycle | 58 (7.6) | 16 (13.2) | 5 (3.1) | 14 (5.2) | 17 (10.6) | 7 (10.5) | 0.0048 |
| Clinical pregnancy, n (%) | 544 (35.4) | 122 (54.2)a | 120 (44.8)b | 204 (36.4)c | 73 (24.0)d | 25 (13.8)e | < 0.01 |
| Live birth, n (%) | 417 (27.1) | 106 (47.1)a | 95 (35.5)b | 156 (27.8)c | 47 (15.5)d | 13 (7.2)e | < 0.01 |
| Miscarriage, n (%) | 127 (23.4) | 16 (13.1)a | 25 (20.8)ab | 48 (23.5)b | 26 (35.6)c | 12 (48.0)c | < 0.01 |
Different letters represent significant differences between groups (P < 0.01)
NA not applicable, no. number