Final answer:
Middle range nursing theories are developed by theorists with clinical experience and focus on specific aspects of nursing practice, applicable across patient populations.
Step-by-step explanation:
The statement that is most accurate concerning middle range nursing theories is that they are developed by nursing theorists with extensive clinical experience. Middle range nursing theories are not highly specific and narrow in focus, instead, they focus on a specific aspect of nursing practice and can be applied across various patient populations and settings.
Unlike grand theories that attempt to explain broad principles about human societies and behavior, middle range theories provide guidance on interventions and outcomes for specific patient conditions or situations. Therefore, these theories bridge the gap between grand nursing theories and nursing practice.