Questionnaires
A modified American Thoracic Society standardised respiratory
symptom questionnaire20 was administered to each
subject on his or her return to work after rest at the end of
rotation at each survey. The questionnaire was translated into
Chinese and back translated into English to verify accuracy.
The collected information included a complete work history,
respiratory symptoms, and smoking history. The outcomes of
interest in this analysis included byssinosis, chest tightness,
chronic bronchitis, chronic cough, and dyspnoea. The
questions on byssinosis were collected only in active workers.
The questions on other respiratory symptoms were asked
regardless of workers’ retirement status.
QuestionnairesA modified American Thoracic Society standardised respiratorysymptom questionnaire20 was administered to eachsubject on his or her return to work after rest at the end ofrotation at each survey. The questionnaire was translated intoChinese and back translated into English to verify accuracy.The collected information included a complete work history,respiratory symptoms, and smoking history. The outcomes ofinterest in this analysis included byssinosis, chest tightness,chronic bronchitis, chronic cough, and dyspnoea. Thequestions on byssinosis were collected only in active workers.The questions on other respiratory symptoms were askedregardless of workers’ retirement status.
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