Table 3

Prevalence (%) of respiratory symptoms with relation to cumulative dust exposure (in dustyears)

Controls≤2525–100>100p value*
*Exact Cochran Armitage test.
Symptoms
    Mucosal irritation 016.322.424.5<0.001
    Dry nose 712.229.432.5<0.001
    Blocked nose 2.812.223.129.8<0.001
    Sneezing attacks 1.4 03.55.30.076
    Nose bleeding 4.2 9.311.79.80.198
    Hoarseness 0 22.14.60.046
    Cough 014.316.817.20.001
    Phlegm 0 23.54.60.066
    Dyspnoea 0 03.56.60.006
    Exercise induced dyspnoea 9.7 9.312.319.90.021
Diseases
    Sinusitis 6.9 5.67.36.60.999
    Laryngitis 5.6 00.73.10.552
    Chronic bronchitis12.5 5.619.623.60.006
    Asthma 2.8 5.67.33.30.999
    Pneumonia13.913.016.711.20.647
    Tuberculosis 1.4 02.72.60.437
    Acute bronchitis 9.7 3.712.09.20.760