Table 3.

Prevalence of respiratory symptoms among exposed and unexposed groups (N = 560)

Work-related respiratory Symptoms	Flour mill workers, N (%)	Control group, N (%)	P value
Cough	82 (29.3%)	23 (8.2%)	< 0.0001
Productive cough	73 (26.1%)	5 (1.8%)	< 0.0001
Phlegm	85 (30.4%)	30 (10.7%)	< 0.0001
Chest illness	122 (43.6%)	22 (7.9%)	< 0.0001
Dyspnea	94 (33.6%)	7 (2.5%)	< 0.0001

Keys: N number