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#1
03-05-2011
 USMLE Forums Guru Steps History: Step 1 Only Posts: 487 Threads: 95 Thanked 1,458 Times in 356 Posts Reputation: 1468
NBME form 1 qn 37

37. The table shows the distribution of spinal cord injuries and deaths by type of accident:

--------------------Fatal---------- All
Type of accident ----N ---%*----N ------%**
Highway traffic ----54----78.3----101----65.6
Falls ---------------4-----5.8-----20-----13.0
Recreational --------1 ----1.4-----12-----7.8
Occupational -------6-----8.7-----11-----7.1
Assault-------------1-----1.4------5-----3.2
Other --------------3-----4.3------5-----3.2
Total -------------69----100.0---154----100.0

N = number
* = % of all spinal cord injuries
** = % of all deaths

Based on these data, what is the case-fatality rate for recreational spinal cord injuries?

A) 1/12

B) 1/13

C) 1/69

D) 1.4/7.8

E) 7.1/8.7
 The above post was thanked by: FrontalBossing (03-05-2011), Mondoshawan (03-06-2011)

#2
03-05-2011
 USMLE Forums Scout Steps History: Not yet Posts: 36 Threads: 3 Thanked 51 Times in 24 Posts Reputation: 61

My answer is B. 13 cases of recreational spinal cord injury, with only being fatal
 The above post was thanked by: aktorque (03-05-2011), Mondoshawan (03-06-2011)
#3
03-06-2011
 USMLE Forums Master Steps History: 1+CK+CS Posts: 590 Threads: 31 Thanked 1,227 Times in 410 Posts Reputation: 1251

Oh, I read the chart as 12 cases, 1 of which was fatal, so I would have chosen A...
 The above post was thanked by: aktorque (03-06-2011), FrontalBossing (03-06-2011)
#4
03-06-2011
 USMLE Forums Guru Steps History: CK Only Posts: 475 Threads: 39 Thanked 351 Times in 169 Posts Reputation: 374

B -1 death out of total recreational spinal injury 13.
 The above post was thanked by: aktorque (03-06-2011)
#5
03-06-2011
 USMLE Forums Guru Steps History: Step 1 Only Posts: 487 Threads: 95 Thanked 1,458 Times in 356 Posts Reputation: 1468

lol... i was confused as well, The ans key says that one out of twelve (as Mondoshawan said). B/c the first column says # of spinal cord injury and the second column says total # of death. So, if we take the # right from the chart and put it together, we'll get 1/12 (choice A). But if we consider the total # of people including spinal cord injury (fatal) and the non-spinal cord injury people and put together, we'll get 1/13 (as FrontalBossing and 1TA2B said) choice B.

I don't know which one is correct. Both seems to be the correct ans, but one should be the most correct....
#6
03-06-2011
 USMLE Forums Master Steps History: 1+CK+CS Posts: 590 Threads: 31 Thanked 1,227 Times in 410 Posts Reputation: 1251

Quote:
 Originally Posted by aktorque ...the first column says # of spinal cord injury and the second column says total # of death...

The way I read the chart, the first column is # deaths and the second column is total # of injuries (including deaths). Since they are only asking about a division within recreational spinal cords accidents, we can get rid of everything else:

------------------------Fatal---------- All
Type of accident -------N---%*------N ------%**
Highway traffic -------54----78.3----101----65.6
Falls -------------------4-----5.8-----20-----13.0

Recreational ---------1 ----1.4-----12-----7.8
Occupational ----------6-----8.7-----11-----7.1
Assault-----------------1-----1.4------5-----3.2
Other ------------------3-----4.3------5-----3.2
Total -----------------69----100.0---154----100.0

If total # of accidents (12) includes the one in which the injury was fatal, then it seems like the fatality rate must be 1 in 12...
 The above post was thanked by: aktorque (03-06-2011), doctorsmonsters (03-06-2011)
#7
03-06-2011
 USMLE Forums Scout Steps History: Not yet Posts: 59 Threads: 12 Thanked 49 Times in 19 Posts Reputation: 59

hi guys
my answer is A.
for those who chosed the option B,the 1 case of fatal is incluided in the total (13).the total says all cases, fatal spinal cord and no spinal cord.
 The above post was thanked by: aktorque (03-06-2011)

 Tags Biostatistics-Epidemiology, NBME-, Step-1-Questions

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