Table 3

Chest imaging abnormalities in engineered stone workers with silicosis

OverallAustraliaIsraelSpainUSAP value*
N=169N=14N=125N=20N=10
Abnormal chest imaging findings†, n (%)
 Simple silicosis only‡105 (62.1)7 (50.0)80 (64.0)10 (50.0)8 (80.0)0.3157
 Simple silicosis and complicated silicosis/PMF§55 (32.5)5 (35.7)38 (30.4)10 (50.0)2 (20.0)0.2871
 Ground glass opacities26 (15.4)5 (35.7)16 (12.8)2 (10.0)3 (30.0)0.0608
 Mediastinal/hilar adenopathy126 (74.6)12 (85.7)94 (75.2)13 (65.0)7 (70.0)0.5649
 Lymph node silicosis only6 (3.6)2 (14.3)4 (3.2)0 (0.0)0 (0.0)0.1971
  • *Fisher’s exact test for cross-country comparison; individual comparisons.

  • †Three cases did not have findings consistent with silicosis on imaging, instead lung biopsy revealed findings consistent with silicosis. These cases are included in the overall analysis.

  • ‡Simple silicosis defined as small ≤1 cm rounded or irregular opacities seen on chest CT, or ≥1/0 profusion small opacities on ILO B-read chest radiograph.

  • §Complicated silicosis/PMF defined as presence of lesions/masses >1 cm in diameter on chest CT or large opacities (category A/B/C) on ILO B-read chest radiograph.

  • ILO, International Labour Office ; PMF, progressive massive fibrosis.