Table 1

Sociodemographic factors and health risk factors associated with hypertensive disorders of pregnancy (HDP)

CharacteristicsStatusN (%, column)Percentage of HDPOR (99% CI)†
Family history of high blood pressureNo33 349 (46)71.00
Yes38 470 (54)142.14 (2.00 to 2.30)*
Family history of strokeNo53 416 (74)101.00
Yes18 403 (26)131.13 (1.05 to 1.21)*
Smoking statusNever46 832 (65)111.00
Past19 996 (28)110.95 (0.89 to 1.02)
Current4669 (7)90.79 (0.69 to 0.91)*
Past oral contraceptive useNo12 339 (17)91.00
Yes58 440 (81)111.28 (1.17 to 1.40)*
Number of children17581 (11)91.00
229 298 (41)101.10 (0.98 to 1.23)
321 441 (30)111.23 (1.09 to 1.38)*
4 or more13 499 (19)121.46 (1.29 to 1.65)*
  • Percentage of HDP is the percentage of women who responded with ‘yes’ to having had high blood pressure during pregnancy. Percentages do not consistently total to 100% due to missing values.

  • *p<0.01.

  • †Adjusted for family history of high blood pressure and stroke, smoking status, history of oral contraceptive use and number of children.