which of the following issues can be explored with epidemiologic research?
regarding epidemiology, which of the following is incorrect？
the definition of epidemiology can be summarized as
the three levels of epidemiological research refer to
the three stages of epidemiologic work are to
the research scope of epidemiology is
which of the following is not major research methods of epidemiology?
the fundamental difference between the observational method and the experimental method of epidemiological research is
the application of a new treatment can increase the number of people recovered from a certain disease. which of the following will happen if the treatment is applied()
which of the following statements about cumulative incidence and the prevalence is incorrect ()
what's the best description of the case fatality rate and mortality ()
which of the following is the numerator when calculating cumulative incidence? ()
the mortality rate of tb in this area in 1960 was ()
by conducting a diabetes census for the first time in a certain place, which of the following indicators can be estimated ()
from november 2002 to early june 2003, a severe acute respiratory syndrome (sars) epidemic occurred in china, and the case fatality rate of sars should be ()
the following sampling method with the allest sampling error is ()
which of the following advantages of cross-sectional studies is correct( )
descriptive study applies mostly to（ ）
which of the following cannot be achieved through the cross-sectional study?
which of the method using a group of iniduals as a unit of observation and ysis?
which of the method can be used to achieve early detection and treatment of the patients
which type of the following study design does cohort study belong to?
if cases in the study population occurred at the beginning of the study, which study cannot be conducted?
what is the difference between retrospective cohort study and prospective cohort study?
in ytical epidemiological studies, which of the following is the most appropriate definition of exposure
in cohort study, which is the most commonly used indicator to yze the strength of association between disease and risk factors?
relative risk is ( )
the most important advantage of cohort study is that ( )
participants enrolled in cohort studies should be ( )