Table 5 Monochorionic and dichorionic twin pregnancies comparison

 Maternal age (years)

29.49 ± 3.69

29.58 ± 4.17

0.797

 gestational week (weeks)

36.20 ± 2.27

36.05 ± 2.30

0.542

 Average birth weight (g)

2612.53 ± 523.61

2566.37 ± 507.27

0.263

 Proportion of primary infertility (%)

(1250/2104)59.41

(73/122)59.84

0.926

 Fresh cycle ratio (%)

(632/2104)30.04

(34/122)27.87

0.611

 Complete miscarriage rate (%)

(153/2104)7.27

(30/122)24.59

p < 0.001

 Early miscarriage rate(< 12 weeks) (%)

(43/2104)2.04

(17/122)13.93

P < 0.001

 Late miscarriage rate (12–28 weeks)

(110/2104)5.23

(13/122)10.66

0.011

 Premature delivery rate (%)

(941/1951)48.23

(56/92)60.87

0.018

 Early premature delivery (28–34 weeks) (%)

(221/1951)11.33

(10/92)10.87

0.892

 Late premature delivery (34-37 weeks) (%)

(720/1951)36.90

(46/92)50.00

0.011

 survival rate rate (%)

(1939/2104)92.16

(92/122)75.41

p < 0.001

 Singleton survival rate rate (%)

(291/2104)13.83

(14/122)11.48

0.462

 Twin survival rate rate (%)

(1648/2104)78.33

(75/122)61.48

p < 0.001

 Percentage of twins, one live, one stillbirth (%)

(0/2104)0

(3/122)2.46

p < 0.001

 Double stillbirth (%)

(12/2104)0.57

(0/122)0.00

1.000

 Cesarean section rate (%)

(1776/1951)91.03

(86/92)93.48

0.419

 LBW rate (%) (< 2500 g)

(1293/3611)35.81

(69/170)40.59

0.204

 VLBW rate (< 1500 g) (%)

(100/3611)2.77

(3/170)1.76

0.628

 Birth weight discordance>25% (%)

(119/3320)3.58

(5/78)6.41

0.207

 Percentage of boys (%)

(1997/3611)55.30

(100/170)58.82

0.367

 Gestational hypertension (%)

(105/2104)4.99

(8/122)6.56

0.443

 gestational diabetes mellitus (%)

(48/2104)2.28

(5/122)4.10

0.210

 intrahepatic cholestasis of pregnancy (%)

(8/2104)0.38

(2/122)1.64

0.101

 twin-twin transfusion syndrome (%)

(0/2104)0

(4/122)3.28

p < 0.001

 Neonatal deformities (%)

(24/3611)0.66

(1/170)0.59

1.000