“…However, it also can be depressed in conscious patients. 22,26 In this study, the involuntary cough was stimulated by 2 mL of normal saline, and different subjects may have had different reflex thresholds. We found that The Յ 25th, 25th through 50th, 50th through 75th, and Ͼ 75th percentile of the V-CPF were classified as lower quartile, third quartile, second quartile, and upper quartile, respectively.…”