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.
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 |
|
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. |
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|
|
|
F |
Died at the end of year 6. At the start of the study, she had already had Alzheimer’s disease for 2 years. |
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|
|
|
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. |
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- Calculate the point prevalence of Alzheimer’s disease at the end of year 5.
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