What demographic factor can influence costs for prescription drug benefits?

The demographic factor that influences costs for prescription drug benefits significantly is the disease mix based on age and gender. This is because varying age groups and genders can have different healthcare needs, which directly affects the types and quantities of medications required. For instance, older individuals often have more chronic conditions and may require more prescriptions, leading to higher costs for the plan. Moreover, certain diseases may be more prevalent in specific age groups or genders, further shaping the overall expenses related to the pharmacy benefit. Understanding this demographic mix allows employers and insurers to better predict drug spending and develop appropriate benefits packages that meet the needs of their workforce while managing costs effectively.