Before revision: Disadvantages Retrospective studies have disadvantages vis-a-vis prospective studies: Some key statistics cannot be measured, and significant biases may affect the selection of URL Researchers cannot control exposure or outcome assessment, and instead must rely on others for accurate recordkeeping.
After revision: Disadvantages Retrospective studies ggggghave disadvantages vis-a-vis prospective studies: Some key statistics cannot be measured, and significant biases may affect the selection of URL Researchers cannot control exposure or outcome assessment, and instead must rely on others for accurate recordkeeping.