Table 2. Oropharyngeal pH Results by Cohort.

	Control (18)	Laryngeal (18)	Laryngeal + Reflux (17)	P-value
Abnormal % Time pH < 5.0, n (%)	0 (0)	2 (11.1)	2 (11.8)	0.3
% Time pH < 5.0, Total, Mean (SD)	0.1 (0.2)	1.1 (2.7)	1.5 (3.9)	0.3
% Time pH < 5.0, Upright, Mean (SD)	0.1 (0.2)	1.0 (2.7)	0.4 (1.2)	0.3
% Time pH < 5.0, Supine, Mean (SD)	0.3 (0.6)	1.1 (2.8)	4.0 (10.4)	0.2
Abnormal % Time pH < 5.5, n (%)	3 (16.7)	1 (5.6)	3 (17.6)	0.5
% Time pH < 5.5, Total, Mean (SD)	4.4 (8.9)	5.5 (8.7)	6.3 (8.6)	0.8
% Time pH < 5.5, Upright, Mean (SD)	0.4 (0.6)	1.5 (2.7)	1.1 (2.0)	0.2
% Time pH < 5.5, Supine, Mean (SD)	10.2 (22.3)	10.8 (15.4)	1.1 (2.0)	0.9
Abnormal Upright RYAN Score, n (%)	6 (33.3)	11 (61.1)	8 (47.1)	0.3
Abnormal Supine RYAN Score, n (%)	0 (0)	4 (22.2)	3 (17.6)	0.1
Abnormal Upright RYAN Score Adjusted, n (%)	4 (22.2)	10 (55.6)	8 (47.1)	0.1

^*Abnormal determined by existing 95^th percentile normative thresholds as recommended by the manufacturer: > 2.33% for pH below 5.0, > 16.6% for pH below 5.5, upright RYAN score > 9.4 and supine RYAN score > 6.89.^{11, 13}