Final answer:
The study conducted by the nurse analyzing treatment outcomes for pressure ulcers is classified as an outcomes study, which assesses both patient and system-related results.
Step-by-step explanation:
The study described in the question involves a nurse investigating both patient outcomes and financial outcomes related to a specific treatment protocol for managing pressure ulcers. This type of study is best classified as an outcomes study. Outcomes studies focus on understanding the end results of healthcare practices and interventions, including patient-related outcomes, such as health status and quality of life, as well as system-related outcomes like financial impact and efficiency. They can use both quantitative and qualitative data to arrive at conclusions.