Is it likely that the pre-existing injury or illness would NOT have resulted in death but for the occupational event or exposure?

• The pre-existing injury or illness would likely NOT have resulted in death in the absence of the occupational event or exposure.
• The pre-existing injury or illness could have resulted in death in the absence of the occupational event or exposure.

* Note: "but for" the occupational event or exposure means "except for" or "absent" the aggravating effects of the workplace.