Conflicting evidence - a concern not only for cycle helmet research
http://www.cyclehelmets.org/mf.html#1134
Abstract:
"The study of cycle helmets is beset by conflicts between case-control
studies, which infer large benefits from helmet use by comparing
injuries of cyclists who chose to wear helmets with those who did not,
and data from entire cyclist populations when substantial increases in
cycle helmet use (sometimes as a result of legislation) show that the
benefits, if any, fall far short of those predicted by case-control
studies.
"Cycle helmet research is not the only area of research where such
conflicts exist, as evidenced by an increasing number of papers in
epidemiological journals drawing attention to this problem. There have
been issues with studies of the effect of hormone replacement therapy
on heart disease, vitamin supplements, antibiotics and the MMR triple
vaccine. Findings that had appeared robust subsequently turned out to
be unreliable or simply wrong. "
Some other new content is in process at the moment, and several pages
have been updated recently. I am going to talk to John about a
"subscribe" option.
Guy
--
http://www.chapmancentral.co.uk
"To every complex problem there is a solution which is
simple, neat and wrong" - HL Mencken