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| Characteristics | PCS group (n=14,296) | PVD group (n=23,810) | P |
|---|---|---|---|
| Age | 33.51±8.17 | 32.11±8.93 | <0.01 |
| ≥35 years old | 6,067 (42.44%) | 7,369 (30.94%) | <0.01 |
| Pregnancy times | 3.20±2.27 | 3.09±2.10 | <0.01 |
| BMI | 27.16±6.83 | 26.44±6.50 | <0.01 |
| BMI ≥28 | 5,142 (35.97%) | 6,680 (28.06%) | <0.01 |
| IVF-ET | 91 (0.63%) | 349 (1.47%) | <0.01 |
IVF-ET, in vitro fertilization and embryo transfer.
