Table 3.

—Correlation of Cough Frequency With Other Baseline Variables

Variable	Infrequent (n = 69)	Intermittent (n = 37)	Persistent (n = 7)	P Value
Pulmonary function tests
FVC	68.11 (13.59)	67.1 (12.29)	69.76 (9.13)	.76
Total lung capacity	70.1 (12.01)	69.99 (13.51)	65.23 (12.34)	.62
Diffusing capacity of the lung for carbon monoxide	47.36 (13.18)	43.58 (13.42)	41.18 (10.56)	.11
Health perception
Physical component summary	31.48 (10.51)	31.8 (10.63)	30.56 (9.38)	.89
Mental component summary	49.75 (9.8)	49.38 (11.71)	50.4 (6.4)	.94
Baseline dyspnea index	5.86 (1.72)	5.95 (1.72)	6.43 (2.07)	.12
Health Assessment Questionnaire	0.84 (0.65)	0.89 (0.82)	0.82 (0.62)
High-resolution CT scan
Maximal fibrosis	1.91 (1.01)	2.3 (0.91)	3 (0.89)	.01
MaxGG	0.68 (0.75)	0.57 (0.8)	1.33 (1.03)	.97
Maximal honeycomb score	35	41	50	.46
BAL
PMN	6.05 (6.06)	6.45 (6.22)	14.87 (17.23)	.27
Eos	2.95 (3.55)	2.46 (4.85)	2.1 (1.69)	.42
Clinical
Rodnan	14.91 (9.81)	12.16 (11.45)	10 (11.96)	.01
Diffuse	64	38	43	.01
Gastroesophageal reflux disease	58	38	100	.68
Proton pump inhibitor use	49	57	43	.68

Pulmonary function tests are presented as % predicted (SD), and clinical scores (except Rodnan) are presented as %. See Table 1 legend for expansion of abbreviations.