作者对1990年1月1日～1992年6月30日西澳大利亚出生的477例单胎产前应用皮质类固醇和早产儿出生大小的相关性进行研究。对高危早产者,在24孕周开始给予倍他米松211.4mg,间隔12或24小时治疗。婴儿出生时测体重,身高及头围。按西澳大利亚性别—特定体重标准,用婴儿的出生体重除以性别和孕龄的平均出生体重计算出生体重比率。3岁时随访,进行全身及神经系统检查,智力 The authors studied the association of 477 singleton prenatal corticosteroids and prenatal birth sizes in Western Australia from January 1, 1990 to June 30, 1992. For high-risk prematures, betamethasone is administered at a dose of 211.4 mg beginning at 24 weeks of gestation, with an interval of 12 or 24 hours. Baby born weight, height and head circumference. The birth weight ratio is calculated by dividing the birth weight of a baby by the average birth weight of the sex and gestational age according to the Western Australian gender-specific weight criteria. Follow-up at 3 years of age, systemic and neurological examination, intelligence