Final answer:
Technical performance, responsiveness to patient preferences, and amenities are attributes that characterize the quality of healthcare services, but excess staff is not one of these attributes.
Step-by-step explanation:
The attributes that can characterize the quality of healthcare services include technical performance, responsiveness to patient preferences, and amenities. However, excess staff is not one of these attributes. Excess staff does not directly contribute to the quality of healthcare services and can actually increase costs without improving patient outcomes.