“In adult patients undergoing surgery, how does guided imagery compared with music therapy affect analgesia use within the first 24 hours CHAPTER 18 Evidence-Based Nursing Practice 283 post-op?” The population (P) was “adult patients undergoing surgery.” The intervention of interest (I) was “guided imagery.” The comparison intervention (C) was “music therapy.” The outcome (O) was “analgesia use.” Finally, the time (T) was “the first 24 hours post-op.