As a retired Safety Professional, I routinely used the National Safety Councils "Accident Facts" as a part of my justification for implementing Safety Programs and Policies.
I stopped using their work when I discovered they cooked the data to support various Political agendas.
Specifically, they included the death of a 13 year old liquor store robber as an accidental gun death. The fool held up a Liquor Store with a broken TEC 9. The store was the site of a off duty cop poker game. The game had been going on for over 30 years.
The raw base data must be examined, broken down by categories and then reported. Only then can a real decision be made.
Frankly, the study sounds like a professor needed to publish in order to get Tenure.