Fig 3. Subjective rating of the running level definitions for the three rounds of this Delphi study.

Changes in subjective ratings were accompanied by updating the running levels definition based on respondents’ feedback. The diamonds represent the median of each round and the bars indicate the interquartile range. Each shaded dot indicates one response made by a respondent. The asterisk (*) indicates a statistical difference in the subjective ratings (p = 0.006).