摘要: Matching is defined as the process of making a study group and a comparison group comparable with res[阅读全文:]
摘要: Case-control studies start with the identification of people with the disease of interst and a contro[阅读全文:]
摘要: Screening is the early detection and presumptive identification of an unrecognized disease or deficit[阅读全文:]
摘要: Confounding variable is an extraneous factor that relates(positively or negatively)with both the outc[阅读全文:]
摘要: Observational study is a kind of epidemiology.We observe and measure the occurrence of the disease or[阅读全文:]
摘要: Bias is a systematic error ,it exsits in the design ,conduct or analysis of a study and it may result[阅读全文:]
摘要: Cross-sectional study is a type of descriptive study,is also called prevalence study.It is an investi[阅读全文:]
摘要: Prevalence measures the rate of occurrence of both new and ongoing cases of diseases in a given popul[阅读全文:]
摘要: ncidence measures the rate of occurrence of new cases of disease in a given population in a given tim[阅读全文:]
摘要: PYLL is measure of the socio-economic impact of the premature death of an individual.It is measured b[阅读全文:]
