Perinatal outcomes of singletons following double vitrification-warming procedures: a retrospective study using propensity score analysis

Table 4 Adjusted odds ratios of PTB, LBW, macrosomia and birthweight difference (once = 1)

Embryo vitrification-warming times	PTB		LBW		Macrosomia		Birthweight		LGA
Embryo vitrification-warming times	OR(95%CI)	P	OR(95%CI)	P	OR(95%CI)	P	β(95%CI)	P	OR(95%CI)	P
Unadjusted OR before matching (n = 647)	0.90 (0.43, 1.91)	0.79	0.73 (0.25, 2.14)	0.56	0.74 (0.35, 1.58)	0.44	55.81 (− 107.39, 219.01)	0.50	0.94 (0.49, 1.81)	0.86
Adjusted OR before matching (n = 647)	1.06 (0.47, 2.40)	0.88	0.77 (0.05, 12.32)	0.85	0.67 (0.29, 1.59)	0.37	40.11 (−81.66, 210.17)	0.52	1.03 (0.50, 2.11)	0.93
OR after matching (n = 108)	1.28 (0.48, 3.39)	0.62	0.48 (0.08, 2.74)	0.41	0.63 (0.21, 1.90)	0.41	22.28 (− 221.17, 265.72)	0.86	1.47 (0.62, 3.51)	0.38
Adjusted after matching (n = 108)	2.58 (0.77, 8.63)	0.12	0.83 (0.08, 8.29)	0.88	0.60 (0.13, 2.69)	0.51	1.51 (− 187.74, 190.77)	0.99	1.51 (0.53, 4.27)	0.44

Adjusting for female retrieval age, BMI, FSH, embryo transfer cycles, parity, the type of infertility and the quality of embryos, gestational age and infant gender. β is the regression coefficient or partial regression coefficient of linear regression

ISSN: 1471-2393