Table 1.

Distribution of Penetration–Aspiration Scale (PAS) scores according to bolus viscosity.

PAS Score	PAS Description	n (%) of Thin Liquid Swallows	n (%) of Extremely Thick Liquid Swallows
1	Material does not enter the airway.	216 (55%)	152 (64%)
2	Material enters the airway, remains above the vocal folds, and is ejected from the airway.	59 (15%)	23 (10%)
3	Material enters the airway, remains above the vocal folds, and is not ejected from the airway.	43 (11%)	35 (15%)
4	Material enters the airway, contacts the vocal folds, and is ejected from the airway.	8 (2%)	1 (0.33%)
5	Material enters the airway, contacts the vocal folds, and is not ejected from the airway.	16 (4%)	1 (0.33%)
6	Material enters the airway, passes below the vocal folds, and is ejected into the larynx or out of the airway.	4 (1%)	1 (0.33%)
7	Material enters the airway, passes below the vocal folds, and is not ejected from the trachea despite effort.	20 (5%)	9 (4%)
8	Material enters the airway, passes below the vocal folds, and no effort is made to eject.	27 (7%)	15 (6%)