Momas I, Daures J P, Gremy F
Département de l'Information Médicale, C.H.U. Lapeyronie, Montpellier, France.
Rev Epidemiol Sante Publique. 1991;39(2):197-207.
A case-control investigation about bladder cancer was carried out in Herault department with 219 incident cases from January 1987 to May 1989 and two control groups: 196 hospital controls randomized from hospital admission lists and 794 population controls randomized from census data. According to the comparison for those two groups, there are few socio-demographic differences; but hospital controls are more exposed to smoking, coffee, alcohol, artificial sweetners. So, the odds ratios with those hospital controls are under-estimated. We can evaluate the resulting biais.
在埃罗省开展了一项关于膀胱癌的病例对照研究，研究对象为1987年1月至1989年5月期间的219例新发病例，设有两个对照组：一组是从医院入院名单中随机抽取的196名医院对照者，另一组是从人口普查数据中随机抽取的794名社区对照者。对这两组进行比较后发现，社会人口统计学差异不大；但医院对照者吸烟、喝咖啡、饮酒及摄入人工甜味剂的情况更为普遍。因此，与那些医院对照者相比的优势比被低估了。我们可以评估由此产生的偏差。
