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Lost Time Injury Incidence Rate (LTIIR)

Last updated: May 13, 2019

What Does Lost Time Injury Incidence Rate (LTIIR) Mean?

Lost time injury incidence rate (LTIIR) refers to the number of lost time injuries relative to the number of employees calculated over a specified time period. The LTIIR differs from the LTIFR in that the LTIFR calculates the number of LTIs over a given time frame relative to the total amount of hours worked within that time frame, whereas the LTIIR provides a metric for the rate of incidence of LTIs among employees over a given time frame.

Safeopedia Explains Lost Time Injury Incidence Rate (LTIIR)

The LTIIR uses the same LTI data as the LTIFR calculation, but rather than using hours as a standardizing factor for the rate, the standardizing factor becomes a number of employees. The standard number is typically 100. This means that the calculation will reveal the number of LTIs experienced per 100 employees.

If you wanted to know the LTIIR for a certain time period, you would collect the data for that time period for the number of LTIs, and how many employees there were during that time period.

Example: Let's say that there were 5 LTIs during the last quarter, and there were 367 employees during this time period.

5 X 100 = 500

500 / 367 = 1.36

This means that there were 1.36 LTIs per 100 employees in the last quarter. This can also be expressed by saying that for every 100 employees, 1.36 experienced a lost time injury.


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