于1968年诊断为单纯煤工尘肺之125名男性,九年后复查,该时他们的平均年龄为59.6岁。在前后两次检查中都鉴定了他们的肺功能和其对运动试验的反应。在观察期间未发现单纯尘肺进展的证据,但有14例胸片上发生了不规则的小阴影,28例显示有进行性大块纤维化 A total of 125 men diagnosed with coal worker pneumoconiosis in 1968 were reviewed nine years later, when their average age was 59.6 years. Their lung function and their response to exercise tests were identified both before and after the exam. No evidence of pure pneumoconiosis was observed during the observation period, but irregular small shadows occurred in 14 cases of chest radiographs and progressive massive fibrosis was observed in 28 cases