Conclusion: it's effective to decrease the birth of fetal chromosomal abnormality by undergoing prenatal screening and diagnose with mother serum biochemical indicator in the second trimester.
结论孕中期应用母血清生化指标进行产前筛查，结合产前诊断是减少染色体异常患儿出生的有效方法。
2
Based on the attribute reduction of rough set, from different aspects, this paper sets up indicatorscreening model based on rough set.
基于粗糙集的属性约简原理，本文从不同的角度建立了基于粗糙集的指标筛选模型。
3
The study on the validity, reliability and control effect of the screening method of regarding water contact as chemotherapy indicator was carried out in schistosomiasis medium endemicity.