An electronic visual analog scale measuring fear/discomfort increased dose-dependently with carbon dioxide concentration, as did results of the Panic Symptom List evaluation.

• 一种用来测量恐惧/不适的电子直观类比标度随着二氧化碳的浓度升高而增加（剂量依赖性），恐慌症状列表评估结果也是如此。