Fig. 2. Box plot analysis demonstrates the relation between the modified Observer's Assessment of Alertness/Sedation Scale (mOAA/S) and State Entropy, Response Entropy, and Bispectral Index during the induction phase and during the emergence phase in infants (  A ) and children (  B ). The mOAA/S scores 4 and 3 were not encountered in infants and the score 4 was not encountered in children in the induction phase. The box plots and whiskers show the mOAA/S values of State Entropy (  light gray boxes ), Response Entropy (  white boxes ), and Bispectral Index (  dark gray boxes ). The  bold black line within each box indicates the median, the  bottom and the top of the box indicate 25% and 75% ranges of the group, with the  distance between the top and the bottom being the interquartile range. The  whiskers indicate the range of the group.