Methods An epide miological investigation and routine physical examination, including ECG, ches t X-rayed and pulmonary function were performed in 367 chlorine-exposers and 1 89 controls.

• 方法对376名氯气作业工人及189名对照进行问卷调查以及内科、眼科、五官科、口腔科、心电图、胸片、肺功能检查。