The frequency rate for that year is calculated as:
FR = Lost time injuries times 1 000 000 divided by the total number of hours worked.
That is:
FR = 8 x 1 000 000/350 000
Therefore, in this example the frequency rate = 22.86
The incidence rate of occupational injuries and diseases is the number of occurrences expressed as a rate per thousand wage and salary earners employed.
A workplace employs 150 employees who work a total of 350 000 hours in a year. During this year there are a total of 8 lost time injuries (a lost time injury is any injury that results in the loss of at least one entire shift). These lost time injuries result in a total of 180 days off.
The incidence rate for that year is:
IR = Lost time injuries times 1000 divided by the number of wage earners.
That is:
IR = 8 x 1000/150 employees
Therefore, in this example the incidence rate = 53.33.
The average time lost rate of occupational injuries and diseases is the average time lost per occurrence of injury or disease. This rate provides a measure of the severity of the occurrences being experienced by workplaces over time. This can also be described as the severity rate (SR).
A workplace employs 150 employees who work a total of 350 000 hours