identifying the type of bias being described in each scenario
The prognosis for neuroblastoma, a tumor that occurs in young children, varies greatly by patient. Some tumors are slow-growing and may even heal spontaneously. Others tumors are fast-growing and aggressive. A urine screening test for neuroblastoma is currently available that detects metabolites produced by the tumor. It has been suggested that such screening is highly valuable PH20001 Essentials of Epidemiology 2 because the case-fatality rate of neuroblastoma among children diagnosed with the urine test is much lower than it is for those who were not screened.
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#. In this case urine screening test for neuroblastoma is the bias
Lead time bias is occurring . When screening results in earlier diagnosis . Without screening a patient is diagnosed with cancer due to symptoms .
identifying the type of bias being described in each scenario The prognosis for neuroblastoma, a tumor...
identifying the type of bias being described in each scenario. Suppose that a new screening test has recently been developed to aid in the early identification of individuals with rheumatoid arthritis. However, the value of the test has not yet been established. In an effort to test the effectiveness of the new test in predicting a future diagnosis of rheumatoid arthritis, investigators enroll a group of volunteer participants, record their test result, and follow them forward for the development of...