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Table 1 Basic clinical characteristics and pregnancy outcomes of subsequent embryo transfer cycle following miscarriage in an initial IVF cycle
| Variables | N (mean ± SD) |
|---|---|
| Number | 645 |
| Age (year) | 32.0 ± 4.8 |
| BMI (kg/m2) | 22.6 ± 3.3 |
| AFC (n) | 14.5 ± 5.8 |
| Baseline FSH (IU/L) | 7.4 ± 2.3 |
| Baseline LH (IU/L) | 4.6 ± 3.4 |
| E2 on hCG day (pg/mL) | 4714.2 ± 2638.1 |
| P on hCG day (ng/mL) | 1.0 ± 0.9 |
| Gestational age of miscarriage (week) | 9.1 ± 2.2 |
| Types of miscarriage in first cycle | |
| Embryonic or fetal death | 521 |
| Spontaneous miscarriage | 74 |
| Anembryonic gestation | 51 |
| Interval time between two cycles (day) | 367.3 ± 187.9 |
| Oocytes retrieved in first cycle (n) | 5.8 ± 6.1 |
| Number of embryos transferred in first cycle (n) | 1.9 ± 0.3 |
| Number of embryos transferred in second cycle (n) | 1.8 ± 0.4 |
| Treatment methods in first cycle (n) | |
| IVF/ICSI | 346 |
| FET | 299 |
| Treatment methods in second cycle (n) | |
| IVF/ICSI | 60 |
| FET | 585 |
| Endometrial thickness in first cycle (mm) | 10.0 ± 1.9 |
| Endometrial thickness in second cycle (mm) | 9.3 ± 1.5 |
| Endometrial thickness change (mm) | 0.7 ± 1.8 |
| Take surgical evacuation after miscarriage (n) | 495 |
| Non surgical evacuation after miscarriage (n) | 150 |
| Implantation rate in second cycle (%) | 40.8 (462/1133) |
| Clinical pregnancy rate in second cycle (%) | 54.7 (353/645) |
| Live birth rate in second cycle (%) | 42.8 (276/645) |
| Miscarriage rate in second cycle (%) | 16.4 (58/353) |
