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#1
06-06-2014
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 592 Threads: 92 Thanked 195 Times in 127 Posts Reputation: 205
NBME 13 Epidemiology Q.

does annual mortality rate equals case fatality rate?
and if it does so, why the answer is NOT B then, since
40000 equal the people who died from the disease / 100000 that is the population. i picked B and it was wrong, i cannot find a proper explanation so someone please help!! thanks

A retrospective study is conducted to assess the incidence and outcome of subarachnoid hemorrhage in a midwestern state.
The annual incidence of this condition is 15 per 100,000 people, and the case fatality rate is 40%. Based on these data, which of the following represents the annual mortality rate for subarachnoid hemorrhage per 100,000 people in this state?

A) 0.4 x 15
B) 0.4 x 100,000
C) 0.6 x 15
D) 0.6 x 100,000
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#2
06-06-2014
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 824 Threads: 66 Thanked 462 Times in 298 Posts Reputation: 472

Quote:
 Originally Posted by drpisho does annual mortality rate equals case fatality rate? and if it does so, why the answer is NOT B then, since 40000 equal the people who died from the disease / 100000 that is the population. i picked B and it was wrong, i cannot find a proper explanation so someone please help!! thanks A retrospective study is conducted to assess the incidence and outcome of subarachnoid hemorrhage in a midwestern state. The annual incidence of this condition is 15 per 100,000 people, and the case fatality rate is 40%. Based on these data, which of the following represents the annual mortality rate for subarachnoid hemorrhage per 100,000 people in this state? A) 0.4 x 15 B) 0.4 x 100,000 C) 0.6 x 15 D) 0.6 x 100,000
incidence is 15 cases per 100.000
from this 15 cases 40% die of this condition
so case fatality rate is 0.4x15=annual mortality rate from subarachnoid hemorrhage
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 The above post was thanked by: drpisho (06-07-2014)
#3
06-07-2014
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 592 Threads: 92 Thanked 195 Times in 127 Posts Reputation: 205

Quote:
 Originally Posted by MedicalExaminer incidence is 15 cases per 100.000 from this 15 cases 40% die of this condition so case fatality rate is 0.4x15=annual mortality rate from subarachnoid hemorrhage
thanks a lot
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