Table 4—

Comparison of demographic and exposure characteristics and pulmonary function test results of subjects with or without silicosis

No silicosisWith silicosisp-value
Subjects n6877
Age yrs23±623±50.95
Age at first exposure to sandblasting yrs17±616±50.28
Total exposure duration months32±2741±23<0.05
Duration since the last exposure months41±2844±280.51
Latency period# months73±3486±35<0.05
Number of places of work2.2±1.33.0±0.7<0.05
Number of sandblasting devices at the workplace4.2±1.53.7±0.7<0.05
Smokers or ex-smokers43 (63)57 (74)0.16
Smoking in smokers pack-yrs6.8±4.37.9±4.60.23
Sleeping at the workplace58 (85)67 (87)0.77
Working as a foreman51 (75)73 (95)<0.001
Seniority as a foreman months26±2846±25<0.01
Symptomatic57 (84)66 (86)0.75
FEV1 L4.22±0.713.66±0.96<0.001
FEV1 % pred105.6±18.789.8±23.4<0.001
FVC L4.84±0.744.27±1.04<0.001
FVC % pred103.4±19.988.5±21.1<0.001
FEV1/FVC %87.6±9.586.3±9.50.44
  • Data are presented as mean±sd or n (%), unless otherwise stated. FEV1: forced expiratory volume in one second; % pred: % predicted; FVC: forced vital capacity. #: time elapsed since the beginning of exposure.