Which base hours are used for normalizing injury metrics such as DART and TRIR?

Which base hours are used for normalizing injury metrics such as DART and TRIR?

• A. 100,000 hours
• B. 40,000 hours
• C. 200,000 hours
• D. 2,000,000 hours

Answer: (C)

Injury metrics like DART and TRIR are made comparable across different workplaces by using a fixed base of hours for normalization. That standard base represents the annual hours worked by a typical workforce of 100 full-time employees. The rate is conceptually computed by taking the number of incidents and scaling it by that fixed base, then dividing by the total hours actually worked in the period. This keeps the numbers interpretable and comparable, regardless of company size or how many hours people actually put in. So the correct approach uses the standard annual hours for 100 full-time workers, ensuring consistency with widely accepted practice. The other bases would imply different assumed workforce sizes and would distort comparability between organizations.

Injury metrics like DART and TRIR are made comparable across different workplaces by using a fixed base of hours for normalization. That standard base represents the annual hours worked by a typical workforce of 100 full-time employees. The rate is conceptually computed by taking the number of incidents and scaling it by that fixed base, then dividing by the total hours actually worked in the period. This keeps the numbers interpretable and comparable, regardless of company size or how many hours people actually put in.

So the correct approach uses the standard annual hours for 100 full-time workers, ensuring consistency with widely accepted practice. The other bases would imply different assumed workforce sizes and would distort comparability between organizations.