Originally Posted by
RazrSkutr
In response to Chasm54's questioning of your assertions on the subject of helmets having being shown to reduce brain injury you have (either knowingly or ignorantly) confounded head injuries in general with brain injuries in specific and, further, made the extreme claim that helmets have been shown to lessen rotational brain injuries.
I did no such thing. Head and brain injuries are separated in these studies, and I made a point that while exact amount of rotational injury is unknown, any such injury would be included in section "intracranial injury", amount of which in total has decreased amongst helmet users in all severity classes.
Originally Posted by
RazrSkutr
In support of these statements you advance a short extract posted above from a study as a "better" (for some unknown value of better) study:
yet this very study has low sample size associated with it and also includes in the very abstract cited a possible alternate explanation for the correlation between helmet absence and injury:
"Better" in case of studies refers to better certainty with less sources of error and less unknown factors. Here, both police and hospital records are cross-referenced, making it rather reliable. A sample size running in thousands is by no means small. The particular study had about 6500 cases, of which in about 1000 major injuries were to the head and to the brain.