Incidence
| Autor: | Tenny S; University of Nebraska Medical Center, Boktor SW; Penn State College of Medicine |
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| Jazyk: | angličtina |
| Zdroj: | 2022 Jan. |
| Abstrakt: | Incidence is the rate of new cases or events over a specified period for the population at risk for the event. In medicine, the incidence is commonly the newly identified cases of a disease or condition per population at risk over a specified timeframe. An example of incidence would be 795,000 new strokes in the United States, annually. Here the incidence is 795,000 new strokes, the population in the United States, and the timeframe is one year. Alternatively, incidence can be specified as person-years. For example, there may be 324 million people in the United States for the measured year, so strokes could be specified as having an incidence of 2.5 strokes per 1,000 person-years. This means there will be on average 2.5 strokes if we watch 1,000 people in the United States for one year. To calculate the person-years incidence of strokes in the United States we perform the following: (795,000 strokes)/(324,000,000 people in the United States during the year) = 2.5 strokes / 1,000 person-years. (Copyright © 2022, StatPearls Publishing LLC.) |
| Databáze: | MEDLINE |
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