Eva <EvaDStructionNO@noverizon.net> wrote:
> This New York Times article will be of interest if you're taking, or
> contemplating taking, these anti-osteoporosis drugs:
> http://www.nytimes.com/2008/07/15/he...c04&ei=5087%0A
The problem of pseudo end points in research studies. People whose
bones get too fragile have light low mass bones. So they found drugs
which add bone mass. But naturally added bone mass goes in exactly
those places which have been strained and possibly microfractured. So
the bone is added in exactly the right places to repair damage and
strengthen.
So how do we knows these drugs cause the extra bone to be deposited in
the right places to strengthen the bone and repair microdamage?
We don't. To do that would be more difficult and more expensive. So
correlations are substituted for causal relationships and they hope
it'll all balance out on average in the end anyway.
If doctors had better scientific educations they wouldn't be taken in
by this kind of profitable sleight-of-hand.
--
Chris Malcolm
cam@infirmatics.ed.ac.uk DoD #205
IPAB, Informatics, JCMB, King's Buildings, Edinburgh, EH9 3JZ, UK
[
http://www.dai.ed.ac.uk/homes/cam/]