In the world, 2 different Injury Reporting Standards are legislated.
- Calculate Injuries per employees’ number
- Calculate Injuries per worked man-hours.
Let’s compare its accuracy and start from LTI frequency per employees.
A company has 100 employees who work 8 hours a day. B company has also 100 employees who work 12 hours a day. Say there were 2 LTI’s for both companies in the past year. If we calculate their Lost Time Injury Frequency (LTIFR) in rolling 12 months, it would be same.
A company’s LTIFR: 2*100/100=2 injuries per 100 employees.
B company’s LTIFR: 2*100/100=2 injuries per 100 employees.
You can’t tell which company performs better.
But, if we see their results in worked MAN-HOURS, it’s different. In rolling 12 months:
A company worked 100 employees*8 hours a day*22 days a month*11 months a year excluding annual leave=193,600 hours.
B company worked 100 employees*12 hours a day*22 days a month*11 months a year excluding annual leave=290,400 hours.
Then we calculate their LTIFR in rolling 12 months, it would be different.
A company’s LTIFR: 2*200.000/193.600=2.07 injuries per 200.000 hours worked.
B company’s LTIFR: 2*200.000/290.400=1.38 injuries per 200.000 hours worked.
B company has 33.3% less injuries than A company.
PS: You can calculate it in 1,000,000 man-hours easily.
------------------------------------
Ganjiguur Bukhbat
www.TheSafetyPoster.com
