Tài liệu Báo cáo y học: "Comparative study of control selection in a national population -based case-control

One of the most important measures for ascertaining the impact of tobacco on a population is the estimation of the mortality attributable to its use. To measure this, a number of indirect methods of quantification are available.1-5 However, although different methodologies are widely used, their methodological foundations are all quite similar. Mainly they are based on the calculation of the proportional attribut-able fraction.