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为了解某厂磷作业工人颌骨损害情况,对84名作业工人拍摄了全景颌骨X线片,以该厂非磷作业工人30名作为对照组。接触组平均工龄15.5年(5～25年)。接触和对照两组平均年龄分别为36.3岁
In order to understand the jaw damage of phosphorus workers in a factory, panoramic images of jaw radiographs were taken on 84 workers and 30 non-phosphorus workers were used as the control group. The average working age of the contact group was 15.5 years (5-25 years). The average age of the two groups in contact and control were 36.3 years