system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The incidence rates of Clostridium difficile are measured in both hospitals and nursing homes throughout a particular county. Those with low rates of infection were marked as having an effective nosocomial infection prevention strategy, while those with high rates were marked as having an ineffective strategy 
If the Department of Health Services wishes to determine whether hospitals or nursing homes have a more effective nosocomial infection prevention strategy, which of the following would be most appropriate?
assistant
The correct answer is  None