Table below shows person-time of exposure for a hypothetical cohort of people. During this time, 6...
Table below shows person-time of exposure for a hypothetical cohort of people. During this time, 6 people developed an outcome of interest. What is the incidence density rate (person-time incidence rate) for the outcome?
| person | person-time (years) |
| 1 | 3 |
| 2 | 0 |
| 3 | 4 |
| 4 | 4.5 |
| 5 | 7 |
| 6 | 1.5 |
| 7 | 4.0 |
| 8 | 0.5 |
| 9 | 3.0 |
| 10 | 1.5 |
| 11 | 1.5 |
| 12 | 2.5 |
Homework Answers
Incidence rate is calculated by dividing number of new cases at a period of time by total number of cases at that period of time ×1000
In this case the total number of people are - 12
Total new cases are -6 ( developed outcome of interest )
Incidence rate for outcome of interest = 6/12×1000= 500
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