# Occupational (OSHA) and Environmental Hazards/TRIR 200,000 vs. 1,000,000 hours

Question
Why it when I calculate my TRIR and I use 200,000 hours it comes out lower than when I use 1,000,000 hours (Total Injuries x 200,000/ hours worked. Our organization only has roughly 110 employees with average 250,000 hours per year but we are getting compared to larger companies with 100,000 employees and 200 million hours.

1 x 200000/243379 = .82
1 x 1,000,000 / 243379 = 4.1

Thank you

Subject: TRIR 200,000  vs. 1,000,000 hours

Question: Why it when I calculate my TRIR and I use 200,000 hours it comes out lower than when I use 1,000,000 hours (Total Injuries x 200,000/ hours worked. Our organization only has roughly 110 employees with average 250,000 hours per year but we are getting compared to larger companies with 100,000 employees and 200 million hours. 1 x 200000/243379 = .82  1 x 1,000,000 / 243379 = 4.1
Thank you

Answer: Keith, the reason for the difference is because the constant in one case (1,000,000) is five times the other (200,000). IF exactly the same criteria are used to determine the number of accidents/incidents to be counted the results with one (the larger) will be 5 times the results of the other (smaller). Thus your 4.1 vs. .82. The use of the 200,000 instead of 1,000,000 came about when OSHA came into being (the early 70's)in part because they felt the older system favored the larger companies. So they went to a constant of 200,000 which was supposed to be the hours of exactly 100 employees working exactly 40 hours per week and exactly 50 weeks per year. This might have worked if they had left the criteria for what was an accident/incident. They didn't and have changed the rules several additional times. As a result the current situation makes a truly accurate comparison between companies and over any large period of time in my opinion impossible. Then you get into the area where not everyone interrupts the rules the same and company A might have 10 accidents where company B would determine the occurrences to be 14.  Thus can you compare your results with someone else and be confident the comparison is fair and accurate - I think not. Could I get really wound up on this topic - yes. With that I will consider my answer done but also state if you have any further questions, please feel free to ask.

Michael Brown, CSP Retired

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Occupational (OSHA) and Environmental Hazards