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Table 1 Risk factors for VTEs during inpatient stays with delivery from 2007 to 2013

From: Case-crossover study to examine the change in postpartum risk of pulmonary embolism over time

Variable

n = 5,517,680a

Pre-term delivery

12.8%b (n = 475,935)

Maternal age >35 years

14.4% (n = 798,074)

Preeclampsia or eclampsia

4.1% (n = 229,853)

Morbid obesity (BMI ≥40 kg/m2)

0.3% (n = 18,871)

Cesarean section

19.6% (n = 1,084,005)

Postpartum hemorrhage

3.6% (n = 201,338)

Postpartum infection

1.4% (n = 77,968)

Birth weight <2.5 kg

5.8%c (n = 266,174)

  1. a The results have been truncated to one decimal place
  2. b 1,333,025 missing values (collection was mandatory from 2009 onwards only)
  3. c 952,821 missing values (collection was mandatory from 2009 onwards only)