PSA and Screening

Question 1

2 main purposes of screening

Answer 1

Identifying those with a higher risk of the condition

Treating the target condition early to improve outcomes

Question 2

Validity vs reliability

Answer 2

Validity: test does what we are expecting it to do
Reliability: test provides consistent results with no random error

Question 3

4 most common cancers

Answer 3

Prostate
Breast
Lung
Colorectal

Question 4

Lead time bias

Answer 4

You get diagnosed early so it seems like you live longer, but really you die at the same time as if you had not been screened

Question 5

Length bias

Answer 5

Those with slower growing tumors are more likely to be detected at screening