What is the prevalence of disease in 2006? What is the total person-time at risk for the disease?
Added by Sherry N.
Step 1
- Prevalence is the proportion of individuals who have the disease at a specific point in time or over a specified period. - To calculate prevalence in 2006, determine how many people had the disease during that year. Show more…
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An epidemiologic investigation conducted on January 1st, 2009 identified a population of 1,000 individuals among whom 4 were found to have the disease under study on this date. During the year of the study, 6 additional new cases were found. Among the total of 10 cases, there were 6 deaths during the year. For the 10 cases, the diagram indicates the time of case recognition, periods of observation during the study, and vital status at the time of the termination of observation. A vertical bar at the start of the diagram (patients 1, 2, 3, 4) indicates that the start of the disease had occurred before the study began. Assume that the 990 remaining individuals in the study did not become ill or die during the year of observation. What is the person-time at risk in this study?
Kirsty G.
As an epidemiologist with the Department of Health, you are called on January 1, 2013, to investigate a mysterious disease (disease "X") in the small North Dakota town of YYY (population = 100 on January 1, 2013). Your investigation continues for 12 months, ending on December 31, 2013. The following table provides summary information on 12 individuals in the town. For cases, assume that onset of symptoms occurred at 12:01 am on the date of onset and recurrent disease is not possible. Assume that deaths from other causes and moves occurred at 12:01 am on the date indicated. Assume also that the 88 individuals not shown below were alive, living in YYY, and at risk of disease "X" during the entire 12 months of your investigation. Calculate the following: 1. Total person-years at risk for 2013 2. Point prevalence on January 01, 2013 3. Point prevalence on June 01, 2013 4. Period prevalence for September (9/01/2013 – 9/30/2013) 5. Cumulative incidence for 2013 (January 01 – December 31) 6. Incidence rate for 2013 (January 01 – December 31) 7. Case fatality in the first month after onset (include cases with onset in 2012) Cases of Disease "X" Person | Date of Onset | Outcome A | 11/29/2012 | Died from the disease on 1/22/2013 B | 12/6/2012 | Recovered from the disease on 1/6/2013 C | 12/23/2012 | Recovered from the disease on 1/14/2013 D | 1/11/2013 | Died from the disease on 1/13/2013 E | 2/5/2013 | Recovered from the disease on 6/18/2013 F | 5/31/2013 | Recovered from the disease on 6/8/2013 G | 9/8/2013 | Died from the disease on 9/18/2013 H | 10/28/2013 | Recovered from the disease on 11/7/2013 I | 12/17/2013 | Died from the disease on 12/29/2013 Notes on other residents Person | Note J | Moved to Fargo on 3/7/2013 (lost to follow-up) K | Died of another cause on 4/11/2013 L | Died of another cause on 7/20/2013
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