Table 2 The pregnancy and neonatal outcomes of the matched groups

Clinical pregnancy

58.7(44/75)

50.4(189/375)

0.191

OR (95% CI)

1.53(0.90–2.61)

Reference

0.118

Biochemical pregnancy

2.7(2/75)

4.8(18/375)

0.550

OR (95% CI)

0.49(0.10–2.29)

Reference

0.361

Ectopic pregnancy

9.1(4/44)

1.3(3/189)

0.025

OR (95% CI)

12.60(0.93–170.78)

Reference

0.057

Miscarriage

11.4(5/44)

19.0(36/189)

0.228

OR (95% CI)

0.59(0.20–1.71)

Reference

0.326

Implantation

43.9(50/114)

38.7(230/595)

0.298

OR (95% CI)

1.29(0.76–2.18)

Reference

0.348

Multiple gestation

18.2(8/44)

22.2(42/189)

0.557

OR (95% CI)

0.89(0.33–2.43)

Reference

0.822

Live birth

48.0(36/75)

40.5(152/375)

0.231

OR (95% CI)

1.47(0.87–2.50)

Reference

0.154

Multiple birth

18.2(8/44)

19.6(37/189)

0.833

OR (95% CI)

1.08(0.39–2.98)

Reference

0.883

Uterine rupture

4.5(2/44)

0(0/0)

0.035

OR (95% CI)

–

–

Mode of delivery

0.363

 Vaginal

16.7(6/36)

23.7(36/152)

 Cesarean section

83.3(30/36)

76.3(116/152)

Gestational age at delivery

0.289

  < 28

12.2(5/41)

19.1(36/188)

 28 < age < 37

19.5(8/41)

11.7(22/188)

 37 < age < 42

68.3(28/41)

69.1(130/188)

Neonatal outcomes (%)

WR group

NonEP group

P

Live born infants (n)

48

178

Z-score

0.55(−0.06,1.52)

0.29(−0.32,0.88)

0.084

Low birth weight

6.3(3/48)

5.1(9/178)

0.721

High birth weight

0(0/0)

0.6(1/178)

1.000

Small for gestational age

2.1(1/48)

6.2(11/178)

0.469

Large for gestational age

27.1(13/48)

15.7(28/178)

0.070

Congenital malformations

0(0/0)

1.1(2/178)

1.000

Early neonatal death

2.1(1/48)

0(0/178)

0.212