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.
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.
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