Figure 1. Method scheme of analyzing the relationship between employment status and the prevalence of COPD after stratifying subjects according to smoking experience
Figure 2. Method scheme of analyzing the relationship between employment status and the prevalence of COPD after stratifying subjects according to age group
Table 1. Criteria for the diagnosis of COPD
Table 2. General characteristics of study participants
Table 3. Distribution of pulmonary function status and the prevalence of COPD by employment status
Table 4. Logistic regression analysis: Study participants with smoking experience
Table 5. Logistic regression analysis: Study participants with no smoking experience
Table 6. Logistic regression analysis: Study participants with young age (less than 56 years old)
Table 7. Logistic regression analysis: Study participants with elder age (more than 56 years old)
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