Final answer:
CCOHS does not typically express risk in terms of lifetime percentage chance encounters. Instead, they use relative risk to compare the health event incidence between exposed and non-exposed groups. OHSA and OSHA regulations aim to protect workers from health and safety hazards.
Step-by-step explanation:
The statement that risk levels set by the Canadian Centre for Occupational Health and Safety (CCOHS) are expressed in terms of the percentage chance a worker has of encountering that event in their lifetime is not entirely accurate. The CCOHS does provide guidance on occupational health and safety but expresses risk more often in terms of relative risk, which compares the risk between an exposed group and a non-exposed group.
Relative risk is calculated by dividing the incidence of the health event for the exposed group by the incidence of the health event in the unexposed group. For example, if the exposed group has 3.25 times the number of health events compared to the non-exposed group, then there is an increased risk associated with exposure to that risk factor.
The Occupational Health and Safety Act (OHSA) and regulations under the authority of OSHA set requirements to protect workers from health and safety hazards on the job, such as requiring employers to inform workers about risks and to provide protective equipment.