Epidemiology

Download e-book for kindle: A clinician's guide to statistics and epidemiology in mental by S. Nassir Ghaemi

By S. Nassir Ghaemi

ISBN-10: 0511579519

ISBN-13: 9780511579516

ISBN-10: 0511580932

ISBN-13: 9780511580932

ISBN-10: 052170958X

ISBN-13: 9780521709583

Available and clinically appropriate, A Clinician's advisor to statistical data and Epidemiology in psychological wellbeing and fitness describes statistical options in undeniable English with minimum mathematical content material, making it excellent for the busy surgeon. utilizing transparent language in favour of complicated terminology, barriers of statistical recommendations are emphasised, in addition to the significance of interpretation - in preference to 'number-crunching' - in research. Uniquely for a textual content of this type, there's wide assurance of causation and the conceptual, philosophical and political components concerned, with forthright dialogue of the pharmaceutical industry's function in psychiatric examine. by way of making a higher figuring out of the realm of study, this ebook empowers future health execs to make their very own judgments on which facts to think - and why.

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Additional resources for A clinician's guide to statistics and epidemiology in mental health : measuring truth and uncertainty

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Was this study designed to show that if you took antidepressants for a few months after stroke, you would be more likely to be alive a decade later? Clearly not. The study was designed to show that antidepressants improved depression 3 months after stroke. This paper, published in AJP in 2003, does not even report the original findings of the study (not that it matters); the point is that one gets the impression that this study (of 9-year mortality outcomes) stands on its own, as if it had been planned all along, whereas the more clear way of reporting the study would have been to say that after a 3 month RCT, the researchers decided to check on their patients a decade later to examine mortality as a post-hoc outcome (an outcome they decided to examine long after the study was over).

Assuming that randomization effectively removes most confounding bias (see Chapter 5), the logic of inference only differs between the primary outcome of a properly conducted and analyzed RCT and observational research (like epidemiological studies); but the logic of inference is the same for secondary outcomes and post-hoc analyses of RCTs as it is for observational studies. What is that logic? The logic of the need for constantly being aware of, and seeking to correct for, confounding bias. One should be careful here not to be left with the impression that the key difference is between primary and secondary outcomes; the key issue is that with any outcome, but especially secondary ones, one should pay attention to whether confounding bias has been adequately addressed.

What if it is 52% males, 48% females? 53% vs. 47%? 55% vs. 45%? Where is the cutoff where we should be concerned that randomization might have failed, that chance variation between groups on a variable might have occurred despite randomization? The ten percent solution Here is another part of statistics that is arbitrary: we say that a 10% difference between groups is the cutoff for a potential confounding effect. Thus, since 10% of 50 is 5%, we would be 25 Section 2: Bias concerned about a gender difference that is something like 55% vs.

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A clinician's guide to statistics and epidemiology in mental health : measuring truth and uncertainty by S. Nassir Ghaemi


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