另一个以人群为基础的研究(population-based study)也表明，姊妹之间患内异症的相对危险是对照组的5．2倍。这种集聚性和血亲关系支持内异症的遗传倾向。
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自人类基因组计划开展后，以人群为基础的研究成为遗传学研究的一个热点。
Since the development of Human Genome Project, the population-based research has become a hot topic in the genetics field.
特别是在以人群为基础的研究中有显著正相关性，在病例和对照中相关性较低，但在住院病人研究中这种相关性较高。
In particular, a significant positive association was present in population-based studies, which had lower response rates in cases and controls, but not in hospital-based studies.
2003年至2005年进行的前瞻性以人群为基础的群组研究项目在研究地区招募了怀孕20—26周的妇女。
Study area women were enrolled at 20-26 weeks' gestation in a prospective population-based cohort study that was conducted from 2003 to 2005.
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