Interesting study. Would like to have seen more riders in the study. In my opinion 100 is not a good enough numbers to get a good picture. Nor is one up to one year of study.
I have always been leery of studies with small number of subjects.
I observe from this that if asked to wear data recording equipment for a survey one should emphatically say no thereby minimizing the chance of having a crash or near crash.
Seems to be a issue. 37 out of 100 crash. Not good odds.