Answer: a) Retrospective cohort study
B) Relative risk C) 3.1
The cholesterol level measured in 1992 is a valid determinant of exposure status during the entire study period.
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Answer: When a person's health data is shared or linked without their consent freedom is endangered. People hide their health information due to the lack of confidence or trust they have when a site or person has access to it. Another problem is that others could steal this information about the person and hack their privacy and endanger them. When a person's data is leaked it endangers their life and freedom and it could increase their health problems with the amount of stress it causes.
