9.2 (95% CI = 7.5–11.3) for pedestrians, 6.4 (95% CI = 4.7–8.8) for un-helmeted cyclists
but to me, it looks like the number is
chance of traumatic brain injury as a pedestrian in an accident = 1.4 x the change of traumatic brain injury as a un-helmeted cyclist in an accident.
This seems to not at all take into account the probability of getting into the accident in the first place, which really makes the argument pretty moot.
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It's hard to tell from the abstract alone...
but to me, it looks like the number ischance of traumatic brain injury as a pedestrian in an accident = 1.4 x the change of traumatic brain injury as a un-helmeted cyclist in an accident.
This seems to not at all take into account the probability of getting into the accident in the first place, which really makes the argument pretty moot.