Table 3. Univariable analysis using generalized estimating equations (GEE).

PGT: preimplantation genetic testing; OR: odds ratio; CI: confidence interval

A p-value of <0.05 was considered significant.

Characteristics	OR	95% CI	P-value
Female age	1.11	[1.04 - 1.19]	0.003
Male age	1.05	[1.00 - 1.11]	0.07
Body mass index	1.06	[0.94 - 1.21]	0.33
Anti-Mullerian hormone	0.96	[0.86 - 1.08]	0.51
Female blood type:
1/ A	Reference
2/ B	0.93	[0.46 - 1.86]	0.83
3/ O	1.11	[0.56 - 2.22]	0.76
4/ AB	1.92	[0.74 - 4.97]	0.18
Male blood type:
1/ A	Reference
2/ B	1.65	[0.72 - 3.76]	0.23
3/ O	1.70	[0.75 - 3.86]	0.21
4/ AB	1.37	[0.47 - 4.00]	0.57
Type of infertility:
1/ Primary infertility	Reference
2/ Secondary infertility	0.57	[0.31 - 1.06]	0.08
Indication for PGT:
1/ Elderly couple	Reference
2/ Implantation failure	0.60	[0.11 - 3.24]	0.55
3/ Pregnancy loss	0.60	[0.19 - 1.88]	0.38
4/ Abnormal genetics	0.55	[0.18 - 1.70]	0.30
Female karyotype result:
1/ Normal	Reference
2/ Abnormal	1.05	[0.49 - 2.25]	0.90
Male karyotype result:
1/ Normal	Reference
2/ Abnormal	1.05	[0.56 - 1.97]	0.88
Sperm quality:
1/ Normal	Reference
2/ Abnormal	0.99	[0.54 - 1.80]	0.97
3/ Surgical	1.71	[0.37 - 7.91]	0.49
No. of retrieved oocytes	0.98	[0.94 - 1.01]	0.22
No. of mature oocytes	0.99	[0.95 - 1.03]	0.67
No. of immature oocytes	0.91	[0.81 - 1.02]	0.09
No. of abnormal oocytes	0.86	[0.72 - 1.03]	0.11
Embryo quality:
1/ Good	Reference
2/ Not good	1.17	[0.47 - 2.87]	0.74
Biopsy day:
1/ Day 4	Reference
2/ Day 5	1.13	[0.55 - 2.32]	0.74