neo335
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Q::"the depression study examined several factors impacting the detection and treatment . one primary focus was to develop a biochem test for dg depression. for this research a subpopulation of 300 person were selected and subjected to the dexa test(DST). the resulsts are follows:
dst results
depresseed Neg87 pos 102
nondepressed Neg63 pos 48 """
ques frm kaplan at end of chp 2 /stats behav
ques 5-7 frm 2004/2005 edition, i dont hav this edition... got it frm somewhr..please tell me whether the ans thy hav given is right or not.. incase u hav the edition tehn please do check the ques.. i might be wrong... please do reply back
qs is to calculate specifity and sensitivity
they offer: results: 102/150
102/189
63/150
87/150
63/111
thy giv ans as:
sensitivity is 102/150
specifity=63/150
neo
Edited by neo335 on 07/12/05 - 12:24 PM
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| 99doc
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specifity=63111
sensitivity=102189
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| neo335
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thank u 99doc.....
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| kingsofke
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I have the edition and what you write the table
dst results
depresseed Neg87 pos 102
nondepressed Neg63 pos 48 """ is actually wrong
Actual table is : Actual Depression
DST Results No Yes
Depressed 87 102
Not Depressed 63 48
Now the given ans are right aren't they
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| neo335
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Is the table as following :<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
Actual depr Not actual depr
Diag depress 102 48
Diag not deprs 87 63
king... frm what u ahv written is this the table? if yes.. thn TN= 63 N FP = 48 ..... this means tha specificity will be = 63/63+48 =63/111.
incase the table interprated is wrong plz correct me... thank u fpr replying...
neo
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| ssrpk
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hey neo, ur interpretation is wrong!
pause for a moment! and revise the definition again for true and false neg's and pos's
here,
TN = 63 ; FP= 87 (diagnostic test is giving wrong results cause there is no depresssion)
TP = 102 and FN = 48
try to assess one column at a time ,taking reference from the actual presence or absence of the disease and then decide whether the result is true or false!
BE CAREFUL!
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| kingsofke
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yeah BE CAREFUL! 
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| neo335
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thank u both ...... i'll do so....
neo
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| drk1980
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a positive dexamethasone suppression test is seen in Depressive states. what does a positive DST mean? ...That on administration of dexamethasone there is NO depression/suppression of cortisol secretion, hence positive for an abnormal state right??
why does this Q hold the opp to be true? i looked this Q up from kaplan LN.....for some reason it takes a 'depressed' DST result to be a True Positive! additionally, the 'non-depressed' DST result is calculated as a True Negative!
can anyone explain or cross check this? (pg 31 kaplan 2004)
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