As an HSE professional, there are things you must know. You may not have been involved in the administrative duty with regards to HSE documentation, so you may not have had the privilege to know and understand some things.
Now is your opportunity to know this.
We have been hearing of lost time injury (LTI), but there are other subset of lost time injury that we may not know or pay less attention to; that is the LTIFR (Lost Time Injury Frequency Rate) and LTISR (Lost Time Injury severity rate).
At the end of this article you will understand the following:
- What is Lost Time Injury
- Lost Time Injury Frequency Rate
- Lost Time Injury Severity Rate
- How all these parameters are applicable in our workplaces.
What is Lost time injury (LTI) :
LTI is said to occur when a worker’s injury prevents him/her from returning to work within 24hours after an accident. The assessment of the LTI has been used as an indicator for the Health and Safety performance, and the subset of the lost time injury which are the LTIFR and LTISR helps in proper assessment of the Health and Safety performance; it is a reactive monitoring strategy (Lagging indicator).
The higher your LTI, the greater the indication that your safety performance is lacking and its an indication of poor safety performance. Indications of poor safety performance could result in higher insurance premiums. Your best workers may start looking for employment elsewhere under the belief they’re at safety risk while at work.
READ: What Is An Occupational Injury
What is Lost Time Injury Frequency rate
Lost Time Injury Frequency Rate (LTIFR) is a safety metric which measures the number of lost time injuries (injuries that result in time away from work) per unit of exposure, typically per a certain number of hours worked.
It helps organizations assess the effectiveness of their safety programs and identify trends related to workplace injuries over a specific period. A lower LTIFR generally indicates better safety performance.
Mathematically,
LTIFR is expressed thus: No. of LTI ÷ Manhour (Within the period in assessment) × 1000000
What is Lost Time Injury Severity rate
The lost time injury severity rate (LTISR) is the number of lost days due to work-related injuries per million hours worked in a given period. A lost day is any day or shift that an employee is unable to work due to a work-related injury.
Similar to the Lost Time Injury Frequency Rate (LTIFR), the LTISR incorporates the total hours worked, providing a measure of the severity of lost time injuries relative to the overall work exposure. A lower LTISR indicates a less severe impact of lost time injuries on the workforce.
Mathematical expression;
LTISR is expressed thus: No. of days lost ÷Manhour (Within the period in assessment) × 1000000
Significance of Lost Time Injury, LTIFR, LTISR
Lost time injury, lost time injury frequency rate and the lost time injury severity rate have its significance.
The Lost time injury frequency rate states the number of lost time injury per 1000000 man-hour, while Lost time injury severity rate explains the severity rate of every lost time injury per 1000000 man-hour; all metrics originate from lost time injury.
NOTE: The lower the value deduced from the above calculation, the better. High value portrays poor safety performance, poor safety culture and need for improvement.
Lost time injury frequency rate calculation and standard
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