Table 3 Singleton abnormal perinatal outcome

Fresh cycles

141 (77.0%)

2949 (68.3%)

0.012*

-

FET cycles

42 (23.0%)

1371 (31.7%)

-

Age

31 (28–33)

30 (27–32)

 < 0.001*

-

BMI

21.9 (19.9–24.1)

21.3 (19.6–23.4)

0.034*

-

Male factor infertility

14 (7.7%)

1056 (24.4%)

 < 0.001*

-

Two embryos transferred

48 (26.2%)

1361 (31.5%)

0.132

-

Blastocyst

8 (4.4%)

485 (11.2%)

0.004*

-

HDP

9 (4.9%)

121 (2.8%)

0.094

0.202

Gestational diabetes mellitus

14 (7.7%)

250 (5.8%)

0.293

0.521

Abnormal placenta

4 (2.2%)

165 (3.8%)

0.255

0.277

Cesarean delivery

138 (75.4%)

3206 (74.2%)

0.717

0.684

Preterm delivery, < 37 wk

11 (6.0%)

261 (6.0%)

0.986

0.872

Very preterm delivery, < 32wk

1 (0.5%)

25 (0.6%)

0.955

0.869

Male gender

89 (48.6%)

2357 (54.6%)

0.115

0.096

Low birth weight, < 2,500 g

1 (0.5%)

49 (1.1%)

0.457

0.512

Macrosomia, > 4000 g

14 (7.7%)

204 (4.7%)

0.071

0.140

Fetal malformation

3 (1.6%)

47 (1.1%)

0.486

0.940