Originally Posted by
invisiblehand
As a practical matter, even population based data subject to strict controls remains open to some flaws. Moreover, laboratory studies are not always conducted in a manner such that the results are applicable to the real world situations. So regardless of the study, we should always keep our brains turns on with a good dose of skepticism.
I am hard pressed to think of
any population based study related to bicycling safety subject to strict controls of any kind. Many or most, if not all, seem to have NO controls in considering the effect of population or accident severity variables.