Table 1.

Demographic and clinical characteristics^*

Variables	PH present n = 20	PH absent n = 76	P value
Age, years	49.2 ± 14.2	50.8 ± 13.7	NS
Male/Female, no.	3/17	29/47	NS
Disease duration, months	96.9 ± 57.5	117.1 ± 75.2	NS
Smoker/Nonsmoker, no.	4/16	10/66	NS
Symptoms
Cough, no.	19	51	0.008
Dyspnea, no.	19	57	0.04
Chest radiographic stage,	-/2/6/3/9	5/22/34/9/6	0.001
no. (0/I/II/III/IV)
Receiving corticosteroids and/	20	49	0.001
or immunosuppressive therapy

^*Data are presented as means ± SDs, unless otherwise indicated. NS = not significant