Hello! Just in from a night shift.
Edit – surely even TJ must have a boredom/pragmatist breaking threshold!
Indeed I have we went thru all thi sin a lot of detail only a couple of weeks ago.
There is no decent evidence that across populations helmet wearing reduces injuries. Daft tho it seems this is consistently shown in multiple studies looking at injury rates before and after helmet compulsion. They simply don't provide much protection from major injuries. ( good at minor ones) and there is evidence they exacerbate major injuries.
In Australian after helmets were made compulsory head injury rates per mile cycled increased and this has been seen in american states as well.
Helmet compulsion reduces the numbers who cycle dramatically and thus increases health risks from lack of exercise – so actually you have more deaths from heart attacks and so on.
Much of the evidence on both sides is poor, counter-intuitive and contradictory. Helmet designs are badly flawed, helmet testing standards are very low and not related to the real world.
I ain't gonna argue this all again – everything I state here is backed by evidence. The only evidence that shows helmets doing any good is from badly designed after the fact surveys of A&E stats which will allways exaggerate positives as its s elf selecting sample.
Wear one if you want – compulsion is shown over and over again to be counterproductive
cyclehelmets.org for the (mainly)anticompulsion argument