attack rate--- - hyatt

[ArchivalUser]

100 go out ot eat in restaurant----50 eat salad------30 fall sick---

is attack rate----30/50---or 30/100---------

[ArchivalUser]

30/50

[ArchivalUser]

i am confused----incidence in this case will ne -----50 /100--right
atack rate ---why is demonator 50 and not 100-----100 were at risk of the attack ?????

[ArchivalUser]

AR is from those exposed. Clearly the exposed are the one who ate,not the whole people who entered the restaurant

[ArchivalUser]

only 50 ate salad!!!!!!!

[ArchivalUser]

Incidence 30/100 or 50/100

[ArchivalUser]

30/100..

[ArchivalUser]

attack rate " = 30/50x 100

sick pt
------------------ X 100
no of person who ate salad

( so attack rate is 60% )