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. Author manuscript; available in PMC: 2013 Jul 1.
Published in final edited form as: Anesthesiology. 2012 Jul;117(1):22–37. doi: 10.1097/ALN.0b013e31825a2a4e

Figure 5.

Figure 5

Reinforcing drug effects were assessed on a 100 mm visual analog scale (VAS). Participants were asked at the end of the infusion phase to provide ratings for average (A) and maximum drug liking (B), and maximum drug disliking (C). Results are ranked from smallest to largest along the x-axis. The VAS scores for drug liking and disliking varied widely among participants, being absent in many but ranking close to the maximum in others. The solid and dashed lines indicate the median and the interquartile range, respectively.