Dear Colleagues,
If you have a response to this query I should be grateful if you would
reply to Najoud Awad directly.
All good wishes,
Olive
Olive Goddard
Centre and Editorial Manager
Centre for Evidence-Based Medicine
Department of Primary Health Care
Old Road Campus, Headington
Oxford, OX3 7LF
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>>> "najoud awad" <[log in to unmask]> 23/03/2007 11:59 >>>
The Name Of God Most Cracious, Most Merciful
I would to ask whate is the correct statistic to calculate agreement
(reliability) between psychiatric screening tool and validation
interview ?
kappa or intraclass correlation? And is that different if screening
tool
contains the same criteria but not the same range of answers (example
PHQ-9
and diagnostic criteria for major depression disorder inDSM-IV
system)? And
is that different if the second interviw is structured clinical
interview or
unstructred? And if I want to calculate post test probability, I choose
Pretest probability based on evidence (such as epidemiological studies
of
prevalence) regardless the prevalence in my study?or according
prevalence
in my study according to screening tool? or according to psychiatric
interview in my study regardless the number who receive this
interview(example 45 or 11% of the sample)?
If the questionnaire contains the same items of criterion measure (as
PHQ-9 ), and I assess how closely it related to diagnostic criteria of
DSM-IV, can I consider this content validity or criterion validity?and
can I
consider the liklehood ratios as validity indexes for diagnostic tests
or
as usefulness of tests?
Thank you.
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