Safety Statistics - Definitions

The following terms are used for reporting IMCA member safety statistics:


Total company hours
The number of hours worked by employees across the entire organisation, including overtime.
Offshore hours
The number of hours worked on vessels, barges, boats or any other offshore structures or installations, based on a 12-hour day.
The number of employees and others who died as a result of an incident. This excludes fatalities occurring as a result of illness or ill-health that occurred at the worksite, such as fatal heart disease.
Lost time injuries
The number of work-related injuries which caused the injured person to be absent from work for at least one normal shift after the event because of unfitness to perform any duties.
Total recordable cases
Total recordables = fatalities + lost time injuries + restricted workday cases + medical treatment cases
Medical treatment (beyond first aid) involves significant work related injuries or illnesses that are diagnosed by a physician or other licensed health care professional. IMCA uses the OSHA (United States Occupational Safety and Health Administration) definition of medical treatment, which is the management and care of a patient to combat a disease or disorder. OSHA's definition of medical treatment does not include visits to a doctor or other licensed health care professional solely for observation, counseling, diagnostic procedures or first aid.
Restricted workday case (RWC) is any work-related injury other than a fatality or lost work day case which results in a person being unfit for full performance of a regular job on the shift/day after the injury.
Safety observations
The number of recorded safety or hazard observations identifying unsafe behaviours, conditions or situations.
LTI causes:
For lost time injuries (LTIs) reported above, it is necessary to include a direct cause. The direct causes of all LTIs reported needs to fall into one of the six categories outlined below. “Other” or “No cause given” is not an option. Submission of data will not be possible unless all the LTIs recorded have causes attributed to them.


Lost time injury frequency rate (LTIFR)
The number of LTIs (including fatalities) per million hours worked.
Total recordable injuries rate (TRIR)
The number of recordable injuries (including fatalities and LTIs) per million hours worked.
Safety observations frequency rate (SOFR)
The number of safety observations per 200,000 hours worked.
Fatal accident rate (FAR)
The number of fatalities per 100 million hours worked.