Table 2.

Respiratory complaints of subjects.

	Exposed subjects n = 93	Controls n = 55	P
Wheezing	56 (60.2%)	24 (45.3%)	>0.05
Dyspnea last year	41 (44.1%)	15 (28.3%)	0.043
Chest tightness last year	35 (37.6%)	8 (15.2%)	0.003
Exercise dyspnea last year	40 (43.0%)	12 (22.6%)	0.010
Dyspnea on level ground	59 (63.4%)	17 (32.1%)	0.0002
Winter morning cough	30 (32.3%)	7 (13.2%)	0.008
Winter daily cough	36 (38.7%)	12 (22.6%)	0.034
Cough for 3 months	25 (26.9%)	8 (15.1%)	>0.05
Winter morning phlegm	26 (28.0%)	6 (11.3%)	0.014
Winter daily phlegm	39 (41.9%)	11 (20.8%)	0.007
Phlegm for 3 months	24 (25.8%)	6 (11.3%)	0.028