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In a study of breast cancer, a mother was considered exposed if she first gave birth at 30 years of age or older

Question 43 

In a study of breast cancer, a mother was considered exposed if she first gave birth at 30 years of age or older. Among 1,628 mothers who were exposed, 31 subsequently developed breast cancer. Among the 4,450 mothers who first gave birth before the age of 30, 65 subsequently developed breast cancer. What type of study design was used for this investigation of the association age at first birth and breast cancer? 

Prospective cohort study 

Retrospective cohort study 

Case-control study 

Clinical trial 

None of the answers listed 


Question 44 

The _______ for a chronic disease is relatively long that is, it takes a considerable amount of time for pathological changes to occur before the clinical manifestation of a chronic disease. 

Susceptibility period 

Incubation period 

Lead time 

Latency period 

None of the answers listed 


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Answer #1

ANSWER

Q.43. Retrospective cohort study.(Effect to Cause study)

       * because in this study researcher consider that a mother was considered

         exposed (Effect) if she first give birth at 30 years of age or older (Cause).

Q.44. Incubation period .It is the time takes for pathological changes to occur before

          the clinical manifestation of a chronic disease.

        

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