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#1
03-13-2015
 USMLE Forums Addict Steps History: 1+CK+CS+3 Posts: 137 Threads: 25 Thanked 118 Times in 70 Posts Reputation: 128
Population Attributable risk percent

Uworld Says (Total risk in population - Risk in unexposed)/risk in total population

Bistats Review section says (Risk in Exposed - Risk in Population)/Risk in exposed

Confused. Can any one explain this thing esp if the prevalance is given in the question. How to solve that??

Thanks

#2
03-13-2015
 USMLE Forums Master Steps History: --- Posts: 956 Threads: 28 Thanked 1,399 Times in 516 Posts Reputation: 1409

Quote:
 Originally Posted by Krazy Uworld Says (Total risk in population - Risk in unexposed)/risk in total population Bistats Review section says (Risk in Exposed - Risk in Population)/Risk in exposed Confused. Can any one explain this thing esp if the prevalance is given in the question. How to solve that?? Thanks
dont stress yourself about that. make sure you know those risks that help you calculate NNT and NNH..
those above calculations I am pretty sure bring to the same results. just calculated form different variables i assume.
the main idea is that PARP unlike ARP measures excess risk in the total population, not-only in the exposed subjects.
PM me
 The above post was thanked by: Krazy (03-13-2015)
#3
07-14-2015
 USMLE Forums Newbie Steps History: Not yet Posts: 4 Threads: 1 Thanked 0 Times in 0 Posts Reputation: 10
Confused!

#4
07-14-2015
 USMLE Forums Newbie Steps History: Not yet Posts: 4 Threads: 1 Thanked 0 Times in 0 Posts Reputation: 10

PARP for observational studies is (Risk in Exposed - Risk in Population)/Risk in exposed).

PARP for cohort studies is (Total risk in population - Risk in unexposed)/risk in total population.

When I compared both the questions that you are mentioning, the only difference is observational studies vs cohort studies.

Please do correct me if i am wrong!!

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