Here's a just-published study on head injury statistics that I found interesting:
https://www.tandfonline.com/doi/full...2.2019.1631483
Table 3 shows that overall floors cause more head injuries than bicycles in the 1-19 age group. And the combination of walls and floors leads bicycles in each of the age groups.
Table 2 shows that 17.1 + 17.2 = 34.3% of head injuries in the study group were caused by furnishings, fixtures, structures, and construction materials in the home.
Of course, I'm mindful that these numbers don't speak to the individual risk when actually participating in a given activity. Most of us will have a greater time exposure to our home than to the activity of cycling, and the study doesn't seem to be looking at how risky a specific activity is when actually partaken in, but rather at which activities contribute the greatest numbers of injuries to young people in the given age ranges.
Just thought I'd share. The numbers are interesting. I thought people here might be interested to see them.