Table 5.

Comparison of RFS between patients with COPD and normal controls matched for age and sex

RFS variables	COPD (n=32)	Normal (n=32)	P-value
Subglottic edema*
0	4 (12.5%)	17 (53.1%)	0.001
2	28 (87.5%)	15 (46.9%)
Vocal fold edema*
0	12 (37.5%)	26 (81.3%)	0.003
1	9 (28.1%)	4 (12.5%)
2	9 (28.1%)	1 (3.1%)
3	2 (6.3%)	1 (3.1%)
4	0	0
Ventricular obliteration*
0	12 (37.5%)	27 (84.4%)	,0.001
2	20 (62.5%)	5 (15.6%)
4	0	0
Diffuse laryngeal edema*
0	6 (18.8%)	16 (50.0%)	0.008
1	14 (43.7%)	14 (43.7%)
2	10 (31.2%)	2 (6.3%)
3	2 (6.3%)	0
4	0	0
Erythema/hyperemia
0	31 (96.9%)	30 (93.7%)	0.500
2	1 (3.1%)	2 (6.3%)
4	0	0
Posterior commissure hypertrophy*
0	1 (3.1%)	12 (37.5%)	0.005
1	18 (56.3%)	14 (43.8%)
2	12 (37.5%)	5 (15.6%)
3	1 (3.1%)	1 (3.1%)
4	0	0
Thick mucus
0	28 (87.5%)	28 (87.5%)	0.650
2	4 (12.5%)	4 (12.5%)
Granuloma
0	32 (100%)	32 (100%)	NA
2	0	0

Note:

^*Significantly predominant in COPD patients.

Abbreviations: COPD, chronic obstructive pulmonary disease; NA, not applicable; RFS, reflux finding score.