12-28-2013, 02:01 AM
can anyone explain me the difference on denominator basis for incidence & prevalance i m getting confused.
Incidence & prevalence - sunroyal
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12-28-2013, 02:01 AM
can anyone explain me the difference on denominator basis for incidence & prevalance i m getting confused.
12-28-2013, 02:42 AM
incidence=new cases in a given period of time/population at risk during the same period...
that is to get the denominator we have to substract the diseased from the total population as they are not at risk for developing the disease for example...if there are 100 new cases of a disease in a one year and the toatl population is 100000 then incidence=100/(100000-100) Prevalence=total no of cases in the given population/entire population example...if there are 500 cases of a disease in a given population of 100000 then prevalence=500/100000 hope this helps
12-28-2013, 03:19 AM
Thx stranger
12-28-2013, 03:23 AM
actually ehy i got confusion is at denominator in first aid they gave population at risk for both incidence & prevalence.my question is why diseased person is himself risk in prevalence.i need explanation for that
12-28-2013, 04:23 AM
incidence is new cases so once a patient is diseased he cannot become new case again hence we substract the news case with the total population
but in prevalence u are calculating the total people who are diseased irrespective of new or old hence u take total population in the denominator
12-28-2013, 05:01 AM
thq
12-28-2013, 05:03 AM
ur welcome :-)
12-28-2013, 10:24 AM
in other words
incidence = number of new cases / number of people at risk of becoming a new case if somebody has disease, he definitely is not at risk of becoming a new case prevalence = number of cases / number of people at risk of being a case denominator here is total pop like stranger said
12-28-2013, 10:32 AM
Perfectly explained!
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