Table 4

Comparison of pneumoconiosis history in migrant workers with pneumoconiosis and state-owned enterprise workers with pneumoconiosis

Variables N (%)Total
N=403
Migrant workers with pneumoconiosis n=198State-owned enterprise workers with pneumoconiosis n=205
Age of morbidity
 18–32*29 (7.20)20 (10.10)9 (4.39)
 33–47204 (50.62)109 (55.05)95 (46.34)
 48–62*160 (39.70)65 (32.83)95 (46.34)
 ≥6310 (2.48)4 (2.02)6 (2.93)
Stage
 I*249 (61.79)106 (53.54)143 (69.76)
 II93 (23.08)50 (25.25)43 (20.98)
 III*61 (15.14)42 (21.21)19 (9.27)
Type of pneumoconiosis
 Silicosis*272 (67.49)149 (75.25)123 (60.00)
 Coal workers’ pneumoconiosis*51 (12.66)17 (8.59)34 (16.59)
 Welders’ pneumoconiosis*20 (4.96)3 (1.52)17 (8.29)
 Castor’s pneumoconiosis*11 (2.73)0 (0.00)11 (5.37)
 Other types of pneumoconiosis49 (12.16)29 (14.65)20 (9.76)
  • *P<0.05/n, where n is the total number of Bonferroni correction tests.