Table 2.
Risk of VCI according to ART type.
| Author | Year | Exp No. |
Exp Events |
Cont No. |
Cont Events |
Crude OR (95%CI) |
Adjusted OR (95%CI) |
|---|---|---|---|---|---|---|---|
| Blastocyst versus Cleavage | |||||||
| Furuya S [25] | 2021 | 662 | 50 | 244 | 5 | 3.91 (1.54–9.91) | 4.86 (1.86–12.68) |
| Volodarsky A [27] | 2021 | 425 | 26 | 252 | 28 | 0.52 (0.30–0.91) | 0.5 (0.3–0.9) |
| Sacha CR [28] | 2020 | 650 | 55 | 490 | 31 | 1.37 (0.87–2.16) | -- |
| Frozen ET versus Fresh ET | |||||||
| Furuya S [25] | 2021 | 708 | 46 | 198 | 9 | 1.46 (0.70–3.04) | 1.58 (0.79–3.55) |
| Sacha CR [28] | 2020 | 211 | 17 | 929 | 69 | 1.09 (0.63–1.90) | -- |
| Frozen ET with versus without PGT | |||||||
| Swanson K [26] | 2021 | 158 | 10 | 153 | 4 | 2.52 (0.77–8.20) | -- |
We calculated ORs using RevMan version 5.4.1 (Cochrane Collaboration, Copenhagen, Denmark), and some values were inferred by the authors; thus, certain numbers in the table may be slightly different from the original values. Abbreviations: ART, assisted reproductive technology; VCI, velamentous cord insertion; Exp No., number of experimental groups; Exp events, number of events in experimental group; Cont number, number of women in the control group; Cont events, number of events in control group; Crude OR, crude odds ratio; Adjusted OR, adjusted odds ratio; CI, confidence interval; Blastocyst, blastocyst transfer; Cleavage, cleavage-stage transfer; Frozen ET, frozen embryo transfer; Fresh ET, fresh embryo transfer; PGT, preimplantation genetic testing; --, not applicable.