The following 8 elderly women were residents of an assisted living facility and were followed by the same doctor for 12 years. The table below describes events that occurred during the 12-year period.    Subject Outcome Person-Years Case Y/N Prevalence Num / Denom A Followed for the full 12 years.  At the end of year 3, she was diagnosed with Alzheimer’s disease.       B Died at the end of year 6 and never had Alzheimer’s disease.       C Died at the end of year 3 and never had Alzheimer’s disease.       D Diagnosed with Alzheimer’s disease at the end of year 1 and died at the end of year 8.       E Lost to follow-up at the end of year 6 and never had Alzheimer’s disease.       F Died at the end of year 6.  At the start of the study, she had already had Alzheimer’s disease for 2 years.       G Lost to follow up at the end of year 9.  At the end of year 4, she was diagnosed with Alzheimer’s disease.       H Followed for the full 12 years, and never had Alzheimer’s disease.       Calculate the point prevalence of Alzheimer’s disease at the end of year 5.

Case Studies In Health Information Management
3rd Edition
ISBN:9781337676908
Author:SCHNERING
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Chapter2: Information Protection: Access, Archival, Privacy, And Security
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Problem 2.20.1C
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The following 8 elderly women were residents of an assisted living facility and were followed by the same doctor for 12 years. The table below describes events that occurred during the 12-year period. 

 

Subject

Outcome

Person-Years

Case Y/N

Prevalence
Num / Denom

A

Followed for the full 12 years.  At the end of year 3, she was diagnosed with Alzheimer’s disease.

 

 

 

B

Died at the end of year 6 and never had Alzheimer’s disease.

 

 

 

C

Died at the end of year 3 and never had Alzheimer’s disease.

 

 

 

D

Diagnosed with Alzheimer’s disease at the end of year 1 and died at the end of year 8.

 

 

 

E

Lost to follow-up at the end of year 6 and never had Alzheimer’s disease.

 

 

 

F

Died at the end of year 6.  At the start of the study, she had already had Alzheimer’s disease for 2 years.

 

 

 

G

Lost to follow up at the end of year 9.  At the end of year 4, she was diagnosed with Alzheimer’s disease.

 

 

 

H

Followed for the full 12 years, and never had Alzheimer’s disease.

 

 

 

  1. Calculate the point prevalence of Alzheimer’s disease at the end of year 5.
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