摘要: Population is the entire collection of units from which a sample may be drawn ,includesfinite populat[阅读全文]

摘要: Molecular epidemiology is a branch of epidemiology.It combines theories and methods in both epidemiol[阅读全文]

摘要:    Case Control StudiesCohort StudyAdvantagesThey are quicker and inexpensive to conductIt[阅读全文]

摘要: AR is a very important and commom measure for the effect of the exposure.It is the difference of the[阅读全文]

摘要: RR is the most common measure for the association between esposure and outcome.The meaning is how man[阅读全文]

摘要: OR is a very useful measure for the association between exposure and outcome.It is the ratio of the o[阅读全文]

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: 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]

摘要: Primary prevention concentrates on the cause prevention or reduction of risk factors,so as to prevent[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: Experimental epidemiology is to identify a group of subjects with the same conditions,and randomizes[阅读全文]

摘要: Ecological study is a type of descriptive study.It is the study of the relationship between some fact[阅读全文]

摘要: Descriptive epidemiology is concerned with the variations of morbidity and mortality in a community.I[阅读全文]