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The total number of cases of a disease in a city
1%
16/1174
The number of new cases of a disease diagnosed during a specific time period
90%
1055/1174
The average number of cases of a disease per year over the last 10 years
2%
18/1174
The number of existing cases of a disease divided by total population in a city
7%
79/1174
The variability in the total number of disease cases between major US cities
0%
1/1174
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As described in the review by Kocher and Zurakowski, incidence is defined as the number of NEW cases of a disease diagnosed during a specific time period per unit measurement of population. This is different from the prevalence of a disease, which is defined as the total number of cases of the disease in the population at a given time. The variance of a disease is an estimate of the variability of each individual data point from the mean, so how each patient with a disease differs from the mean of patients with that disease (e.g. length of symptoms of patients with a disease may differ for individual patients, but a mean duration of symptoms exists for all patients with that disease). Kocher and Zurakowski present a Level 5 review article that is referenced often and discusses basic biostatistic principles.
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