What Does Injury Severity Rate Mean?
The injury severity rate represents the number of lost work days experienced per 100 workers. As the name implies, the injury severity rate attempts to measure how critical the injuries and illnesses experienced by a certain group of employees (in a given workplace or across an entire industry) by using the number of days lost as a proxy for severity.
Injury severity rate can be calculated by the following formula:
Injury severity rate = (number of work days lost + light duty days lost) x 200,000 / total hours worked.