The SAIF Rate is the Severity Adjusted Injury Frequency. It is a simple method of presenting injury severity in terms of the existing Recordable Injury rates.
The SAIF rate works by setting a benchmark injury as a 1:1 match for the injury rate, then setting a severity adjustment relative to the benchmark injury. The benchmark injury is an LTI with a duration of two-weeks lost time.
Real-world severity is complex. By treating severity as an adjustment to the injury frequency we make it easier to inherently understand, and respond to, without getting lost in the complexity of severity.