[nikisweeting]

If I understand correctly, your counter-argument is that this statistic is has no bearing because they fail to divide the total number of Traumatic Brain Injuries by the total number of cyclists, making the comparison of total TBIs for cyclists being 1.4x more than TBIs for pedestrians useless because there are more peds than cyclists.

If that's what you're saying, you didn't read the actual study before posting! In the second paragraph of the abstract for the 2006 french study, they clearly state "The annual incidence and mortality of severe TBI were 6.4 PER 100,000 (95% CI = 4.7–8.8) for un-helmeted cyclists"

The important part being: PER 100,000. Making your counter-argument invalid.

[jrockway]

"PER 100,000" doesn't cover the number of hours spent performing each activity.

[Jemaclus]

Per 100,000 what? Per 100,000 people in the general population? Per 100,000 un-helmeted cyclists? Per 100,000 cyclists in general?