Figure 1.

Anxiety over Time by Class

Note. Min6 = 6^th minute of the task, min8 = 8^th minute of the task, min10 = 10^th minute of the task, min12 = 12^th minute of the task, min14 = 14^th minute of the task, min16 = 16^th minute of the task. Dashed vertical lines represent onset and end of CO₂ administration. Assessment of anxiety was taken at baseline and then every 2 minutes; a small amount of noise on the x-axis was added at each time point to more clearly separate overlapping points.