Homework 1

# Homework 1 - Homework#1 1 We can calculate prevalence...

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Homework #1 1. We can calculate prevalence within the sample of 1,000 people. P = # infected / total in study P = 205/1,000 = 20.5% 20.5% of the 1,000 people sampled from Region A reportedly have the infectious disease at the time of the survey. However, it is important to understand that there may be others who are infected with the disease but are still in the incubation period of the illness and therefore are not reported in the results of the survey. We cannot calculate risk or incidence because the study was at one point in time, not over a span of time. 2. We can calculate the new prevalence within the sample of 1,000 new people. P = # infected / total in study P = 165/1,000 = 16.5% 16.5% of the 1,000 people sampled from Region A reportedly have the infectious disease at the time of the survey. Again, there may be many that are infected but are not reported because of the incubation period. We cannot calculate risk because we do not know how many NEW cases there are. We do not know how many people had the disease before 6 months and how many developed it during the 6 months. 3. It is not possible to tell. The prevalence could be steadily decreasing: Or it could look something like this: Anything could be happening between those two points because we do not have (and cannot calculate) either the risk or the incidence for the study.

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