vemi007
Forum Senior
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AGE (Years)
========================================
20 -24 > 34
========================================|
Birth LOW || 21 54 | 75
Weight NORMAL || 404 745 | 1149
========================================|========
425 799 | 1224
(took a while to get the table in...)
What is the odds ratio for an older woman relative to that of a younder woman to have an infant with a low birth weight?
A. (21/425)/(54/799)
B. (54/799)/(21/425)
C. (54/745)/(21/404)
D. (54/799)*100
E. (54/75)/(745/1149)
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| vemi007
Forum Senior
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the table is messed up...let me try it again...
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| msyamp
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ok
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| vemi007
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i have attached the table diagram again...
Attached Files:
untitled.bmp (1292 KB, 48 downloads)
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| msyamp
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is it c?
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| vemi007
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i am not sure if it is C because the ratio asked in the question is the ratio between older and younger woman who have infant with low birth weight , including normal birth weight should not be part of the calc i think. I went with B because i found it close abut i am not so sure.
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| msyamp
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yes i think you are right.
Any one else? let us take the majority and a right explanation.
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| msyamp
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see this table.i think we can draw some conclusions
Attached Files:
Table 1.doc (34 KB, 17 downloads)
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| msyamp
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Examples
The data listed below is from the breast feeding study.
In the control row, the odds for exclusive breast feeding at discharge are 27 to 20 or odds slightly in favor of exclusive breast feeding. In the treatment row, the odds are 10 to 32 or odds strongly against exclusive breast feeding. The odds ratio for exclusive breast feeding at discharge is (27/20) / (10/32) = 4.32. Since this number is larger than 1, we conclude that breast feeding at discharge is more likely in NG Tube group.
The data in the table below is information about infant birth weights and mortality among white infants in New York City in 1974.
The odds ratio for death in one year is
This odds ratio illustrates that mortality is far more likely in the low birth weight group.
Attached Files:
or04.bmp (344 KB, 8 downloads)
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| zhoufg
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I think C is correct according to the definition of Odds ratio. Anyone else?
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| cyra
Moderator
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I'd go with C too because the questions asks about the odds ratio regarding older women having low birth weight babies as compared to younger women....
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| drswapna
Forum Senior
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the answer is definitely c first rearrange the table if it confuses u the way it is then do AD/BC=54x404/21x745
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