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. 2020 Oct 29;20:655. doi: 10.1186/s12884-020-03353-5

Table 3.

The neonatal outcomes of patients among groups A–E stratified by 35 years of age

<35 years of age ≥ 35 years of age
Group A Group B Group C Group D Group E P Group A Group B Group C Group D Group E P
Cycles (n) 1425 844 206 183 120 144 269 107 39 25

Preterm birth

(<37weeks)

11.77a,b,c

(91/773)

39.45

(215/545)

33.33

(44/132)

42.70

(38/89)

4.55d

(2/44)

 0.000

8.20a,b

(5/61)

35.0

(56/160)

25.0

(13/52)

16.67

(2/12)

16.67

(1/6)

 0.001
Singleton

8.67a

(67/773)

3.30

(18/545)

6.82

(9/132)

3.37

(3/89)

4.55

(2/44)

 0.001

4.92

(3/61)

5.62

(9/160)

7.69

(4/52)

0.0

(0/12)

0.0

(0/6)

 0.755
Twin

3.10a,b,c

(24/773)

36.15

(197/545)

26.51

(35/132)

39.33

(35/89)

0.0d

(0/44)

 0.000

3.28a,b

(2/61)

29.38

(47/160)

17.31

(9/52)

16.67

(2/12)

16.67

(1/6)

 0.000
Gestational age (weeks) 38.70 ± 1.94a,b,c 37.37 ± 2.52 37.59 ± 2.52 36.86 ± 3.33 39.18 ± 1.91d 0.000 38.72 ± 1.23a,b,c 37.61 ± 2.33 37.66 ± 2.89 37.00 ± 3.43 38.32 ± 0.86d 0.022
Singleton 38.80 ± 1.83 38.94 ± 1.71 38.51 ± 2.18 39.00 ± 1.58 39.18 ± 1.91 0.325 38.81 ± 1.56 38.59 ± 2.14 38.76 ± 1.97 38.52 ± 1.71 38.32 ± 0.86 0.951
Twin 35.32 ± 1.47 36.04 ± 2.32 36.02 ± 2.37 35.15 ± 3.01 / 0.095# 36.20 ± 0.40 35.98 ± 1.63 35.06 ± 3.21 34.29 ± 4.99 / 0.330#
Birth height (mm) 49.51 ± 2.3a,b,c 47.72 ± 3.21 48.23 ± 2.41 46.61 ± 4.26 49.89 ± 2.22d 0.000 49.77 ± 1.85a,b,c 48.03 ± 2.70 47.95 ± 3.75 48.31 ± 5.70 49.75 ± 0.96d 0.000
Singleton 49.68 ± 2.27 49.82 ± 1.98 49.88 ± 1.73 49.53 ± 1.44 49.88 ± 2.22 0.838 49.93 ± 1.76 49.50 ± 2.39 49.77 ± 2.41 50.00 ± 2.00 49.75 ± 0.96 0.868
Twin 46.66 ± 2.40 46.72 ± 2.95 46.97 ± 2.20 45.50 ± 4.32 / 0.113# 46.75 ± 0.35 46.90 ± 1.91 45.70 ± 3.70 45.83 ± 6.83 / 0.155#
Birth weight (kg) 3.16 ± .054a,b,c 2.73 ± 0.61 2.79 ± 0.62 2.57 ± 0.66 3.19 ± 0.43d 0.000 3.12 ± 0.51a,b,c 2.76 ± 0.60 2.81 ± 0.75 2.55 ± 0.88 3.30 ± 0.29d 0.000
Singleton 3.22 ± 0.50 3.27 ± 0.51 3.24 ± 0.52 3.17 ± 0.33 3.19 ± 0.43 0.583 3.36 ± 0.49 3.22 ± 0.50 3.24 ± 0.49 3.26 ± 0.45 3.30 ± 0.29 0.666
Twin 2.34 ± 0.43 2.48 ± 0.45 2.44 ± 0.42 2.31 ± 0.54 / 0.113# 2.55 ± 0.25 2.43 ± 0.34 2.24 ± 0.52 2.00 ± 0.82 / 0.142#
Still birth

0.0

(0/773)

0.0

(0/545)

0.0

(0/132)

0.0

(0/89)

0.0

(0/44)

 /

0.0

(0/61)

0.0

(0/160)

0.0

(0/52)

0.0

(0/12)

0.0

(0/6)

 /
Congenital anomalies

1.64

(13/795)

1.60

(13/811)

1.09

(2/184)

1.52

(2/132)

2.27

(1/44)

 0.958

0.0

(0/63)

0.0

(0/217)

0.0

(0/68)

0.0

(0/15)

0.0

(0/6)

 /
Sex ratio(male/female)

1.30

(450/345)

1.43

(477/334)

1.10

(97/87)

1.46

(78/54)

0.83

(20/24)

 0.445

1.43

(37/26)

1.22

(119/98)

1.16

(37/31)

0.63

(6/9)

1.00

(3/3)

 0.632

Low birth weight

(<2500 g) in singleton

7.04a,b,c

(56/795)

27.25

(221/811)

28.26

(52/184)

34.09

(45/132)

4.55d

(2/44)

 0.000

6.34a,b

(4/63)

29.03

(63/217)

27.94

(19/68)

13.33

(2/15)

0.0

(0/6)

 0.002
Singleton

4.02

(32/795)

4.44

(36/811)

4.35

(8/184)

4.55

(6/132)

4.55

(2/44)

 0.977

3.17

(2/63)

2.76

(6/217)

1.47

(1/68)

0.0

(0/1)

0.0

(0/6)

 0.833
Twin

3.02a,b,c

(24/795)

22.81

(185/811)

23.91

(44/184)

29.54

(39/132)

0.0d

(0/44)

 0.000

3.17a,b

(2/63)

26.27

(57/217)

26.47

(18/68)

13.33

(2/15)

0.0

(0/6)

 0.001
Very low birth weight (<1500 g) in singleton

0.75a,c

(6/795)

2.84

(23/811)

1.63

(3/184)

5.30

(7/132)

0.0

(0/44)

 0.001

0.0c

(0/63)

2.76

(6/217)

2.94

(2/68)

13.33

(2/15)

0.0

(0/6)

 0.045
Singleton

0.63

(5/795)

0.12

(1/811)

0.54

(1/184)

0.0

(0/132)

0.0

(0/44)

 0.324

0.0

(0/63)

0.5

(1/217)

0.0

(0/68)

0.0

(0/15)

0.0

(0/6)

 0.879
Twin

0.12a,c

(1/795)

2.72

(22/811)

1.09

(2/184)

5.30

(7/13)

0.0

(0/44)

 0.000

0.0c

(0/63)

2.30

(5/217)

2.94

(2/68)

13.33

(2/15)

0.0

(0/6)

 0.029

#comparison among groups A–D. P < .05 was considered statistically significant

aP < .05 compared to group B

bP < .05 compared to group C

cP < .05 compared to group D

dP < .05 between groups D and E