Incident Rate Calculations Flashcards

A company with 500 employees working 40 hours/week for 50 weeks had 10 recordable injuries. What is the TCIR?

Answer: 4.0

TCIR = (10 × 200,000) / (500 × 40 × 50) = 2,000,000 / 1,000,000 = 2.0; wait — hours = 1,000,000, so TCIR = (10 × 200,000) / 1,000,000 = 2.0.

Which metric specifically measures the number of days away from work per 100 full-time workers?

Answer: DAFW rate

The Days Away From Work (DAFW) rate counts only cases involving days away, while DART includes both days away and job transfer/restriction cases.

A facility's DART rate is 3.5 and its TCIR is 5.0. What percentage of recordable injuries resulted in days away, restriction, or transfer?

Answer: 70%

DART/TCIR × 100 = 3.5/5.0 × 100 = 70%, meaning 70% of recordables were serious enough to affect work capacity.

In OSHA recordkeeping, 200,000 base hours represents the equivalent of how many full-time workers for one year?

Answer: 100 workers

200,000 hours = 100 workers × 2,000 hours/year (50 weeks × 40 hours), which is OSHA's standard base for incident rates.

An employer recorded 3 injuries: one with 10 days away, one with 5 days of job transfer, and one with no days lost. What is used to calculate the DART rate?

Answer: Only the first two injuries

DART counts cases involving days away from work AND cases of job transfer or restriction, so the first two qualify; the no-days-lost case is counted in TCIR but not DART.

A construction site logged 800,000 labor hours and had 6 lost-time injuries. What is the Lost Time Incident Rate (LTIR)?

Answer: 1.50

LTIR = (6 × 200,000) / 800,000 = 1,200,000 / 800,000 = 1.50.

When calculating incident rates, overtime hours worked by employees should be:

Answer: Included in total hours worked

OSHA requires all actual hours worked — including overtime — to be included in the denominator when calculating incident rates.