Lost time injury incident rate, abbreviated as LTIIR, is the frequency of workplace incidents that result in lost time from work. It is a variation of injury rate metrics that specifically focuses on incidents causing employees to miss work beyond the day of the incident.
Lost Time Injury Incident Rate formula
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\( LTIIR \;=\; \dfrac{ TNLTI }{ TNHW } \cdot 200,000 \) (Lost Time Injury Incident Rate) \( TNLTI \;=\; \dfrac{ LTIIR \cdot TNHW }{ 200,000 } \) \( TNHW \;=\; \dfrac{ TNLTI \cdot 200,000 }{ LTIIR } \) |
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| \( LTIIR \) = lost time injury incident rate |
| \( TNLTI \) = total number of lost time incidents |
| \( TNHW \) = total number of hours worked by all employees |
The lost time injury incident rate helps organizations assess the frequency of incidents leading to lost work time, providing insights into workplace safety performance. A lower LTIIR indicates fewer incidents resulting in lost time relative to the number of hours worked, suggesting better safety practices. Conversely, a higher LTIIR indicates a higher frequency of incidents leading to lost time and may signal areas where safety measures need improvement or where specific hazards require attention.
