为研究每天补钙2g是否能降低妊娠高血压综合征(PIH)的发生率,进行一项前瞻性、随机、双盲、有安慰剂对照的试验。1993年10月1日～1994年12月31日在印度国立医学院和妇产科产前门诊,选择健康正常单胎初产妇201例,标准为末次月经日期清楚、孕20周以前在产前门诊登记并准备在该院分娩、糖耐量正常并自愿参加研究者。首次产前门 To investigate whether daily calcium supplementation reduces the incidence of pregnancy-induced hypertension (PIH), a prospective, randomized, double-blind, placebo-controlled trial was conducted. From October 1, 1993 to December 31, 1994 at the National Indian Medical College and Obstetrics and Gynecology Prenatal Clinics, 201 healthy singleton primiparous women were selected. The standard was that the last menstrual date was clear, Outpatient registration and preparation for delivery at the hospital, normal glucose tolerance and voluntary participation in the study. First prenatal door