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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).