User:Bluerasberry/person year
A person year, (also called patient year) is a unit of measurement for describing incidence.[1]
The unit is equivalent to the sum of the number of years the individuals in a cohort are living in the observed condition.[2] During the years when researchers observe the people in the cohort, they count the number of times the people experience a medical issue. At the end the researchers report their findings of observing a certain number of incidents per person years.[2]
The unit is widely used but has some shortcomings.[3] There are alternative measures which also have their own shortcomings.[4]
See also[edit]
References[edit]
- ^ Deng (1 May 2009). "Understanding person-year or patient-year". On Biostatistics and Clinical Trials.
- ^ a b "Concept: Person Years - Calculating in a Cohort Study". mchp-appserv.cpe.umanitoba.ca. University of Manitoba. 30 September 2002.
- ^ Windeler, Jurgen; Lange, Stefan (18 February 1995). "Events per person year—a dubious concept". BMJ. pp. 454–456. doi:10.1136/bmj.310.6977.454.
{{cite web}}: Missing or empty|url=(help) - ^ Aaron, S. D.; Fergusson, D. A. (23 September 2008). "Exaggeration of treatment benefits using the "event-based" number needed to treat". Canadian Medical Association Journal. 179 (7): 669–671. doi:10.1503/cmaj.080018.