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Table 1 Descriptive characteristics of multiparous preeclampsia cases and their multiparous controls

From: Interbirth interval and history of previous preeclampsia: a case–control study among multiparous women

Variable

Cases n = 36

Controls n = 148

Pvalue

Age at delivery (years) (SD)*

31.3 (5.9)

28.1 (4,3)

<0.0005

BMI (kg/m2) (SD)*

25.5 (4.0)

21.6 (3.6)

<0.0005

Renal disease, % (n)

13.9 (5)

2.7 (4)

0.015

Women’s positive Rh factor, % (n)

76.5 (26)

91.2 (135)

0.016

Household monthly expenditure >100,000 AMD, % (n)

55.9 (19)

60.2 (77)

0.065

Barrier method of contraception, % (n)

47.2 (17)

34.5 (51)

0.155

Time to pregnancy ≥12 months, % (n)

40.0 (8)

11.0 (10)

0.004

Family history of preeclampsia, % (n)

20.6 (7)

5.1 (7)

0.008

IBI (years) (SD)*

7.3 (4.5)

4.2 (2.8)

<0.0005

Long IBI (≥5years), % (n)

63.9 (23)

26.7 (39)

0.0005

Stillbirth in previous pregnancies, % (n)

13.9 (5)

4.1 (6)

0.026

History of previous preeclampsia, % (n)

47.2 (17)

4.1 (6)

<0.0005

  1. BMI, Body Mass Index; IBI, Interbirth Interval.
  2. *Mean (standard deviation).