Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Calculating Incidence versus Prevalence

The picture represents 10 new cases of illness over about 15 months in a population of 20 persons. Each horizontal line represents one person. The down arrow indicates the date of onset of illness. The solid line represents the duration of illness. The up arrow and the cross represent the date of recovery and date of death, respectively.

The picture New: Cases of Illness from October 1, 2004–September 30, 2005

Question: Calculate the period prevalence from October 1, 2004, to September 30, 2005. The numerator of period prevalence includes anyone who was ill any time during the period. In Figure 3.1, the first 10 persons were all ill at some time during the period.

4 Date of onset of illness
+ Date of death
4 Date of recovery
Person #
1
2
3
4
5
6
7
8
10
Oct. 1, 2004
Apr. 1, 2005
Sept. 30, 2005
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Transcribed Image Text:4 Date of onset of illness + Date of death 4 Date of recovery Person # 1 2 3 4 5 6 7 8 10 Oct. 1, 2004 Apr. 1, 2005 Sept. 30, 2005
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