Investigators enrolled 100 diabetics without eye disease in a cohort (follow-up) study. The results of the first 3 years were as follows: Person-Years Year 1: 0 cases of eye disease detected; 8 lost to follow-up _________ Year 2: 2 new cases of eye disease detected; 2 deaths; 10 lost to follow-up _________ Year 3: 3 new cases of eye disease detected; 2 more deaths; 13 more lost to follow-up. _________ Assuming that all events occurred at the end of each year, the incidence rate is calculated as:
8) Investigators enrolled 100 diabetics without eye disease in a cohort (follow-up) study. The results of the first 3 years were as follows:
Person-Years
Year 1: 0 cases of eye disease detected; 8 lost to follow-up _________
Year 2: 2 new cases of eye disease detected; 2 deaths; 10 lost to follow-up _________
Year 3: 3 new cases of eye disease detected; 2 more deaths; 13 more lost to follow-up. _________
Assuming that all events occurred at the end of each year, the incidence rate is calculated as:
- 5 / 100
- 5 / 63
- 5 / 270
- 5 / 250
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