The article defined serious injury as
> those requiring days off or job restrictions.
Meanwhile OSHA defined serious injury here: https://www.osha.gov/laws-regs/standardinterpretations/1993-...
Exerpt:
> 1 Impairment of the body in which part of the body is made functionally useless or is substantially reduced in efficiency on or off the job. Such impairment may be permanent or temporary, chronic or acute. Injuries involving such impairment would usually require treatment by a medical doctor. Examples of injuries which constitute such harm include:
a Amputation (loss of all or part of a bodily appendage which includes the loss of bone).
b Concussion.
c Crushing (internal, even through skin surface may be intact).
d Fracture (simple or compound).
e Burns or scald, including electric and chemical burns.
f Cut, laceration, or puncture involving significant bleeding and/or requiring suturing.
The differences in standards (which the article does mention in passing, but in no details) is a potential differentiator.