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Table 1 Overall Baseline clinical characteristics and perinatal outcomes of the study cohort (n = 647)

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

Demographics

 

Female age at retrieval, years

30.3 ± 4.4

Parity

 Primipara

405 (62.6)

 Multipara

242 (37.4)

Body mass index, kg/m2

22.5 ± 3.3

Basal FSH, mIU/mL

7.4 ± 2.7

Duration of infertility, years

3.6 ± 2.7

Type of Infertility

 Primary

316 (48.8)

 Secondary

331 (51.2)

Cause of Infertility

 Ovulation disorder

40 (6.2)

 Tubal factor

285 (44.0)

 Male factors

68 (10.5)

 Other factors

254 (39.3)

IVF characteristics

 Insemination method

  IVF

490 (75.7)

  ICSI

157 (24.3)

Endometrial thickness, mm

9.4 ± 1.7

 Endometrial preparation protocol

  HRT

539 (83.3)

  Ovulation induction

45 (7.0)

  NC

63 (9.7)

Perinatal outcomes

 Gestational age, weeks

38 (37–39)

 PTB (<  37 weeks)

98 (15.1)

 Gender

  Boys

361 (55.8)

  Girls

286 (44.2)

Birthweight, g

3361.5 ± 589.3

LBW (<  2500 g)

36 (5.6)

Macrosomia (≥ 4000 g)

84 (13)

  1. Data are presented as mean ± SD, median (IQR) and n (%). BMI Body mass index, NC Natural cycle, HRT Hormone replacement therapy, PTB Preterm birth, LBW Low birthweight