Determining if an injury happened at work or at home
When deciding if an injury is work-related and recordable on the OSHA 300 Log, employers need to determine if an event in the workplace was a contributing factor. This can be challenging for medical conditions that develop over time, particularly musculoskeletal conditions, since activities at home and work can both be contributing factors.
A case is presumed to be work-related if an event or exposure in the work environment is a discernible cause of the condition. The workplace does not have to be the sole cause, but only needs to be a contributing factor.
More likely than not
OSHA applies a “more likely than not” approach when evaluating whether anything at work contributed to the condition. Employers should evaluate the employee’s duties and work environment to determine whether it’s more likely than not some event or exposure at work caused or contributed to the condition. The employer might ask about activities outside of work that might have contributed, such as playing sports or doing chores. Even if outside activities seem to be the predominant cause, however, something at work could be a contributing factor.
The aggravation of a pre-existing (non-work) condition is particularly challenging, since activities at work could be factors. The employer might determine that activities outside of work are the primary cause, and that job duties are not a significant factor. However, any discernable contribution from work duties or the work environment makes a case work-related. The workplace need not be a significant contributor.
On the other hand, if an employee’s condition arose outside work and there was no discernable event or exposure that contributed to the condition, the employer may decide that the condition is not work-related. Employers must make good-faith determinations when deciding if a particular case should be recorded, and the decision must not be an arbitrary one.
Fortunately, OSHA offered some clarification in a letter of interpretation dated March 17, 2021, stating, “If the employer decides that an injury or illness is not work-related, and OSHA subsequently issues a citation for failure to record, the Government would have the burden of proving that the injury or illness was work-related.”