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Table 5 The risk of different severity of hypertensive disease during pregnancy in the FET compared with the fresh embryo transfer

From: Analysis of the risk of complications during pregnancy in pregnant women with assisted reproductive technology: a retrospective study using registry linkage from 2013 to 2018 in Shanghai, China

Severity

FET versus Fresh a

n

B

P value

Crude ORb

95% CI

B

P value

Adjusted OR c

95% CI

No hypertensive disorders

7085

ref

/

/

/

ref

/

/

/

PIH

413

0.343

0.003

1.409

1.126–1.762

0.315

0.006

1.370

1.092–1.718

Mild pre-eclampsia

332

0.372

0.004

1.450

1.125–1.870

0.356

0.007

1.427

1.102–1.850

Severe pre-eclampsia & HELLPd

272

0.788

< 0.001

2.199

1.612–3.001

0.775

< 0.001

2.170

1.583–2.975

  1. a. The research objects in this table are all FET (n = 5513) and fresh transfers (n = 2589)
  2. FET Frozen-thawed embryo transfer
  3. b. All odds ratio are for the severity of PIH from multinomial logistics regression
  4. c. Adjusted for maternal age, only male infertility, frozen embryo transfer, ICSI, multiple pregnancies
  5. d. HELLP, hemolysis, elevated liver enzymes, and low platelets