Which of the following is not a factor when determining a workers compensation insurance rate?

When assessing workers' compensation insurance rates, several factors are taken into consideration to establish the premium cost for businesses. Among these factors, the type of industry is crucial because different industries have varying levels of risk associated with workplace injuries. For instance, the construction industry is generally considered riskier than an office environment, leading to higher premiums for construction businesses.

The number of claims is another vital factor since a history of frequent claims can indicate increased risk and potential future claims, prompting insurers to raise the premium to mitigate their exposure to that risk. Similarly, the location of the business influences rates because certain areas may have higher risks associated with work-related injuries, either due to local regulations, environmental factors, or crime rates.

In contrast, while the age of the employee can influence specific risk assessments—such as younger employees being potentially less experienced—it's not a direct factor used by insurers to set the overall rates for workers’ compensation coverage. Insurers focus more on the overall exposure and loss experience of the business rather than individual characteristics of employees. Therefore, the age of the employee is not considered a fundamental factor in determining workers' compensation insurance rates.