Homework answers / question archive / George Washington University MPH 6003 Quiz 5 1)Lead time bias will make it appear that the apparent survival time in the non-screened population to be            than the survival time in a similar screened population

George Washington University MPH 6003 Quiz 5 1)Lead time bias will make it appear that the apparent survival time in the non-screened population to be            than the survival time in a similar screened population

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6. Ionizing radiation, benzene, and certain viruses can each individually cause leukemia without the other two exposures, but only if the exposed individual has a certain genetic deficiency. This genetic deficiency by itself does not cause leukemia, but the disease never occurs in the absence of this genetic factor. The genetic deficiency is:

Select one:

 

7. When considering if an association is causal, refuting this criteria will immediately prove it was NOT causal:

 

 

8. A cross sectional study showed that people reporting a high fat intake were 10 times more likely to be depressed. Considering ONLY this study, what criteria for a causal relationship between fat intake and depression is met?

 

 

9. Most diseases have a single cause.

 

 

10. A true causal factor may increase or decrease the chance of disease.

 

 

11. When there is no association there is no causation.

 

12. When there is an association there must be causation.