Greenberg R S
Am J Obstet Gynecol. 1983 Apr 1;145(7):797-801. doi: 10.1016/0002-9378(83)90681-6.
An analysis of United States birth certificate records for the calendar year 1977 indicated that women who failed to seek prenatal care were at increased risk of delivery of a low-birth weight infant, even after social factors were considered. However, the strength of association, as well as the population impact, between antenatal care and birth weight varied by social group. Prenatal care had the greatest observed impact for socially disadvantaged women, because of their high overall risk of delivery of low-birth weight infants. From these observations, it appears that the efficacy of antenatal services is modified by social situation. As a result, summary evaluations of prenatal care impact may underestimate the true value of these services for certain social groups.
对1977年日历年美国出生证明记录的分析表明，即使在考虑了社会因素之后，未寻求产前护理的女性分娩低体重婴儿的风险仍会增加。然而，产前护理与出生体重之间的关联强度以及对人群的影响因社会群体而异。由于社会弱势女性分娩低体重婴儿的总体风险较高，产前护理对她们的影响最为显著。从这些观察结果来看，产前服务的效果会因社会状况而有所不同。因此，对产前护理影响的总体评估可能会低估这些服务对某些社会群体的真正价值。
