From: Fresh versus frozen embryo transfer for full-term singleton birth: a retrospective cohort study
 | Fresh ET(N = 2059) | FET (N = 2053) | χ2 | P |
---|---|---|---|---|
Neonatal malformation | 25 (1.2) | 18 (0.9) | 1.131 | 0.288 |
 Trisomy 13/18/21 | 8 (0.4) | 6 (0.3) | 0.281 | 0.596 |
 Congenital heart disease | 7 (0.3) | 3 (0.15) | 1.592 | 0.207 |
 Polydactyly/syndactyly | 5 (0.2) | 3 (0.15) | 0.495 | 0.482 |
 Others | 5 (0.2) | 6 (0.3) | 0.094 | 0.759 |