Epidemiology of hypertensive disorders of pregnancy and childbirth: population-based study, Thailand.

A geographically population-based epidemiological study was conducted in Thailand under the WHO International Collaborative Study of Hypertensive Disorders of Pregnancy. Prospectively collected data on blood pressure, proteinuria and edema in pregnancy of 4,126 pregnancies were analyzed correlating with pregnancy outcome. The prevalence of mothers with antenatal diastolic pressures equal to or greater than 90 mmHg was approximately 20 per cent.