The incidence of pregnancy-induced hypertension is increased among Colorado residents at high altitude.

Abstract Both pregnancy-induced hypertension and high-altitude residence are associated with fetal growth retardation, thereby leading us to hypothesize that pregnancy-induced hypertension would be more common at high than at low altitude. Retrospectively collected data in Colorado revealed that pregnancy-induced hypertension was more common at 3,100 m (12%) than at 2,410 m (4%) or 1,600 m (3%) (P