The calculation for incidence is the number of new cases divided by the population risk. Remember in this question you were told that 500 of the 2500 have already tested positive for the disease. Now, you will have only 2000ย at riskย for the next year. Therefore, the annual incidence would be number of new cases divided by the population at risk which is ย 200/2000= 10%.
mm9283Is this not a silly question? It's assuming that those 500 individuals cannot get chalmydia again next year, but there is no reason they are still not at risk! It's not like they become immune to it +6
nnasser33I agree. But also, this is a screening of "first-year women college students." So, one year later, would these women no longer be first-year college students?
This question is so poorly written, I tore some hair out reading it.+6
meryen13true nnasser33 but then why do we use the same 2000? those people are also not in first year. the 500 people who got chlamydia are not the only people who are second year students. :D +
submitted by โaoa05(34)
The calculation for incidence is the number of new cases divided by the population risk. Remember in this question you were told that 500 of the 2500 have already tested positive for the disease. Now, you will have only 2000ย at riskย for the next year. Therefore, the annual incidence would be number of new cases divided by the population at risk which is ย 200/2000= 10%.