Birth Defects; Orofacial clefts; Casecontrol Study; Environmental risk factors.

唇腭裂；出生缺陷；病例对照研究；环境危险因素。

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The study compared 573 women who had babies with cleft lip with or without cleft palate or cleft palate alone to 763 women whose children weren't born with orofacial clefts.

该研究把573个产下唇裂儿（其中有些患儿伴有腭裂）的女性与763个产下非唇裂儿的女性进行了对比。

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