Figure 8.

Relationship between respiratory event duration and average (a), median (b), standard deviation (c), and coefficient of variation (d) values calculated from difference envelope within 30-s epochs. The red line displays the median value, the edges of the boxes show the interquartile range (IQR), and the whisker the range of the data without outliers. Outliers were defined as values over 1.5 times IQR from the upper quartile and values below 1.5 times IQR from the lower quartile. Outliers are not presented.