The following question lists examples of observational studies. Select all those that describe a cross-sectional study design?
A.Survey of smokeless tobacco use among ninth-graders in four school districts.
B.Data from the Behavioral Risk Factor Survey were used in a secondary data analysis to examine the effect of income inequality and race on preventive health practices.
C.A study examined the effect of hormone replacement therapy on cancer; using a cancer registry in California identified cancer cases. Controls were selected from a random sample of Bay Area cities.
D.All of the above
A cross sectional study evaluates the relationship between disease or any health related condition that exist in a given population at that point in time or over a short period of time.
In the examples A, B and C to understand the relationship between health conditions in a given population at that point in time' studies were carried out by selecting appropriate samples
Hence D all of the above is correct
The following question lists examples of observational studies. Select all those that describe a cross-sectional study...