Table 7

Odds ratios (95% CI) of respiratory symptoms in relation to dust exposure intensity and years of exposure (adjusted for factory, age, gender, and smoking habits)

Years of exposure
Dust exposure (mg/m3)0 to ≤15>15
Dry nose
    >5 6.1 (2.2 to 20.0) 8.6 (3.2 to 27.8)
    0 to ≤5 3.1 (0.8 to 12.5) 5.7 (1.5 to 23.2)
Blocked nose
    >510.8 (2.9 to 70.5)18.8 (5.3 to 120.7)
    0 to ≤56.4 (1.2 to 49.7)12.5 (2.9 to 88.6)
Mucosal irritation
    >5 3.3 (1.4 to 8.7) 6.6 (2.7 to 18.4)
    0 to ≤5 1 (reference) 3.7 (1.1 to 8.7)
Dry cough
    >5 2.1 (0.9 to 5.5) 3.3 (1.4 to 8.8)
    0 to ≤5 1 (reference) 2.5 (0.7 to 8.7)
Nose bleeding
    >5 3.6 (1.0 to 16.7) 2.5 (0.7 to 11.5)
    0 to ≤5 1.6 (0.3 to 9.6) 2.8 (0.6 to 15.6)
Sinusitis
    >5 0.3 (0.1 to 1.4) 1.1 (0.3 to 4.3)
    0 to ≤5 0.3 (0.04 to 1.4) 0.9 (0.1 to 5.1)
Chronic bronchitis
    >5 0.8 (0.3 to 2.1) 1.6 (0.7 to 4.0)
    0 to ≤5 0.5 (0.1 to 1.7) 1.3 (0.4 to 4.2)
Asthma
    >5 2.5 (0.5 to 19.9) 1.5 (0.3 to 12.1)
    0 to ≤5 2.0 (0.3 to 19.1) 4.0 (0.5 to 40.4)
Pneumonia
    >5 1.0 (0.4 to 2.8) 0.6 (0.2 to 1.5)
    0 to ≤5 0.8 (0.2 to 2.8) 1.6 (0.6 to 4.9)
Acute bronchitis
    >5 0.9 (0.3 to 2.2) 1.0 (0.3 to 3.2)
    0 to ≤5 0.5 (0.1 to 2.2) 1.5 (0.3 to 6.8)