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本文的研究对象均为Bergen大学附属医院妇产科在连续18个月期间来作产前诊断的健康孕妇。均属单胎且无先天性畸形新生儿的妊娠,同时还符合下列条件:妊娠前后无疾病;无阴道流血;孕周≥37周;血压≤140/90mmHg;尿正常;没有与妊娠有关的免疫性疾病;无贫血(用红细胞指数判断)。其中初产妇412例,经产妇456例。自怀孕16周起每天补充铁剂100mg。按时作产前访视直至分娩。并记录孕妇的吸烟习惯,有43%的孕妇吸烟,
The subjects studied in this study were all healthy pregnant women who had been diagnosed prenatally for 18 consecutive months in the obstetrics and gynecology department of the University Hospital Bergen. Are singleton and congenital malformations of neonatal pregnancy, but also meet the following conditions: no disease before and after pregnancy; no vaginal bleeding; gestational age ≥ 37 weeks; blood pressure ≤ 140 / 90mmHg; normal urine; no pregnancy-related immunity Ailments; No anemia (judged by erythrocyte index). Among them, 412 cases of primipara and 456 cases of mothers. From the 16th week of pregnancy every day iron supplementation 100mg. Prenatal visit on time until delivery. And record the smoking habits of pregnant women, 43% of pregnant women smoke,