Table 2 Gestational hypertension and preeclampsia incidence and association with preconception blood pressure in China, 1993–1996

From: Preconception blood pressure and risk of gestational hypertension and preeclampsia: a large cohort study in China

Hypertensive disorders of pregnancy

Hypertension group (n = 2083)

Nonhypertension group (n = 43,545)

Crude RR (95% CI)

Adjusted RR (95% CI)a

No. of cases

Incidence (%)

No. of Cases

Incidence (%)

Gestational hypertension

249

11.95

3743

8.60

1.44 (1.26–1.66)

1.40 (1.22–1.60)

Preeclampsia

85

4.08

993

2.28

1.82 (1.45–2.29)

1.75 (1.39–2.19)

  1. No. number, RR risk ratio, CI confidence interval
  2. aAdjusted for maternal age (continuous), body mass index (BMI) (continuous), education, occupation, folic acid use, ethnicity, and parity
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