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#1
06-02-2011
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 1,357 Threads: 194 Thanked 3,268 Times in 881 Posts Reputation: 3278
Biostatistics #4 - Interpreting a Risk ratio

The relative risks found in the following Table were formed as the ratio of unadjusted inpatient mortality rates associated with two medical procedures in hospital A relative to hospital B.

table.bmp

Which one of the following is the most valid interpretation of these data?

A) The risk of mortality associated with coronary bypass surgery is approximately twice as great in hospital A as in hospital B, and this difference is statistically significant
B) The risk of death from Cesarean section differs little between hospitals, but the small difference is statistically significant
C) The RR of death from Cesarean section is twice as great in hospital B as in hospital A, and this difference is statistically significant
D) The P value suggest that the risk of death from Cesarean section is nearlt twice as important as that arising from coronary artery disease

Last edited by bebix; 06-02-2011 at 09:20 AM. Reason: spelling
 The above post was thanked by: Amenah (06-02-2011), hassanahk (06-02-2011), singapur_md (06-02-2011)

#2
06-02-2011
 USMLE Forums Newbie Steps History: Not yet Posts: 7 Threads: 3 Thanked 1 Time in 1 Post Reputation: 11

i think it is C
 The above post was thanked by: bebix (06-02-2011)
#3
06-02-2011
 USMLE Forums Veteran Steps History: 1+CK+CS+3 Posts: 264 Threads: 16 Thanked 350 Times in 165 Posts Reputation: 360
C

I'l go with C
 The above post was thanked by: bebix (06-02-2011), benzo (06-03-2011)

#4
06-02-2011
 USMLE Forums Addict Steps History: 1 + CS Posts: 113 Threads: 8 Thanked 89 Times in 61 Posts Reputation: 99

sorry...I think is C)

Last edited by Claus_CU; 06-02-2011 at 02:02 PM. Reason: change answer
#5
06-02-2011
 USMLE Forums Scout Steps History: Not yet Posts: 21 Threads: 1 Thanked 16 Times in 13 Posts Reputation: 26

CCCCCCCC!!!

#6
06-02-2011
 USMLE Forums Guru Steps History: 1+CK+CS+3 Posts: 406 Threads: 30 Thanked 141 Times in 109 Posts Reputation: 151

I think C too
#7
06-03-2011
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 1,357 Threads: 194 Thanked 3,268 Times in 881 Posts Reputation: 3278

I guess this was an easy one
 The above post was thanked by: docoftheworld (06-05-2011), eveli55 (02-02-2013), mle guy (06-03-2011)
#8
06-03-2011
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yes i will go with C
#9
02-01-2013
 USMLE Forums Newbie Steps History: --- Posts: 1 Threads: 0 Thanked 0 Times in 0 Posts Reputation: 10
p value

:sorry: i am new here and so far i like this forum,when is p value statistically significant,pls i need explanation
#10
02-01-2013
 USMLE Forums Addict Steps History: Not yet Posts: 138 Threads: 1 Thanked 46 Times in 26 Posts Reputation: 56

p=0,05 or less
#11
02-02-2013
 USMLE Forums Addict Steps History: Not yet Posts: 117 Threads: 5 Thanked 59 Times in 40 Posts Reputation: 69

Quote:
 Originally Posted by BritneySpears p=0,05 or less
ok p = 0.05 means difference is significant..
and RR= 1/2 (A/B) means RR IN B is twice A.. am i correct??
plz correct me if i m wrong!
#12
12-11-2013
 USMLE Forums Scout Steps History: 1+CK+CS Posts: 32 Threads: 14 Thanked 1 Time in 1 Post Reputation: 11

why is it not a ?
p value =0.1 is significant as well bcos it is >0.05

 Tags Biostatistics-Epidemiology, Step-1-Questions

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