This rate is often referred to as the Duration Rate, and is used to indicate the severity of injury. As we saw hen discussing the Frequency Rate, we were unable to determine how serious the LTIs were because this data was not built into the formula.

By using the ATLR in combination with the Frequency Rate a clearer picture of injury performance is possible. The ATLR is calculated by dividing the number of days lost through injury by the number of LTIs.

Average Time Lost Rate = Number of days lost/Number of LTIs

A death is counted as 220 standard working days lost.


In our organization with 500 workers, who experienced 46 LTIs (see Example A), assume the following injury outcomes:

10 LTIs resulted in 3 days each 30
8 LTIs resulted in 6 days each 48
12 LTIs resulted in 14 days each 168
4 LTIs resulted in 20 days each 80
10 LTIs resulted in 28 days each 280
2 LTIs resulted in 42 days each 84

Total 690

Average Time Lost Rate = 690 days lost/ 46 LTIs = 15

As a result of this calculation we are now in a better position to assess the injury performance. We now know the organization has had 40 LTIs per million hours exposure and each injury experienced during the year resulted in an average of 15 days off work.

This additional information provides the safety and health professional with the necessary knowledge required to make decisions and recommendations on the areas of risk within the workplace where resources and effort should be directed.

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1 comment:

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