Table 3

Dust exposure of migrant workers with pneumoconiosis compared with state-owned enterprise workers with pneumoconiosis and migrant workers with non-pulmonary occupational diseases

Variables N (%)Migrant workers with pneumoconiosis n=198State-owned enterprise workers with pneumoconiosis n=205Migrant workers with non-pulmonary occupational diseases n=198
Dust exposure
 Yes198 (100.00)205 (100.00)56 (28.28)*
 No0 (0.00)0 (0.00)142 (71.72)
Age of commencement of dust exposure
 15–29104 (52.53)137 (66.83)†28 (51.85)
 30–4479 (39.90)58 (28.29)†21 (38.89)
 45–5915 (7.58)10 (4.88)5 (9.26)
Duration of dust exposure
 1–553 (26.77)20 (9.76)†19 (33.93)
 6–1079 (39.90)41 (20.00)†15 (26.79)
 11–1526 (13.13)33 (16.10)13 (23.21)
 ≥1640 (20.20)111 (54.15)†9 (16.07)
Dust type (%)‡
 Mineral dust116 (58.59)136 (66.34)8 (14.29)*
 Metallic dust19 (9.60)38 (18.54)†23 (41.07)*
 Artificial inorganic dust44 (22.22)29 (14.15)†8 (14.29)
 Plant-based dust0 (0.00)0 (0.00)1 (1.79)
 Artificial organic dust1 (0.51)0 (0.00)16 (28.57)*
 Mixed dust18 (9.09)2 (0.98)†0 (0.00)*
Smoking during dust exposure
 Yes96 (48.48)87 (42.44)8 (14.29)*
 No102 (51.52)118 (57.56)48 (85.71)
  • *Migrant workers with pneumoconiosis versus migrant workers with non-pulmonary occupational diseases: p<0.05/n, where n is the total number of Bonferroni correction tests.

  • †Migrant workers with pneumoconiosis versus state-owned enterprise workers: p<0.05/n, where n is the total number of Bonferroni correction tests.

  • ‡Mineral dust includes quartz, asbestos, talc, coal, rare earths, etc. Metallic dust includes lead, manganese, iron, etc and their compounds. Artificial inorganic dust such as macadam, cement, glass fibre, etc. Plant-based dust such as cotton, hemp, grains, etc. Artificial organic dust such as synthetic resins, rubber, etc.