Editing Risk factor (section)

==Example==
At a wedding, 74 people ate the chicken and 22 of them were ill, while of the 35 people who had the fish or vegetarian meal only 2 were ill. Did the chicken make the people ill?

:<math>Risk = \frac {\mbox{number of persons experiencing event (food poisoning)}} {\mbox{number of persons exposed to risk factor (food)}}</math><ref>{{Citation|last1=Tenny|first1=Steven|title=Relative Risk|date=2020|url=http://www.ncbi.nlm.nih.gov/books/NBK430824/|work=StatPearls|publisher=StatPearls Publishing|pmid=28613574|access-date=2020-06-10|last2=Hoffman|first2=Mary R.}}</ref>

So the [[chicken]] eaters' risk = 22/74 = 0.297<br />
And non-chicken eaters' risk = 2/35 = 0.057.

Those who ate the chicken had a risk over five times as high as those who did not, that is, a relative risk of more than five. This suggests that eating chicken was the cause of the illness, but this is ''not'' proof.

This example of a risk factor is described in terms of the [[relative risk]] it confers, which is evaluated by comparing the risk of those exposed to the potential risk factor to those not exposed.