>>932807Actually, it will. Helmet users suffer less serious damage overall. If you don't correct for this, you end up with the assumption that helmets protect again broken arms and legs. If you _do_ correct for this, so that injuries of the two groups with and without helmets are weighted the same, the helmets effects on head trauma all but disappears.
This is why the EU survey of bike helmet research and the inquery about bike helmet laws concluded there is no scientific basis for the theory that bike helmets protect against head trauma in traffic, and advised against bike helmet laws.
Not just indifferent - adviced against.
