Abstract: Objective To compare the consistency of symptom-based questionnaire for identifying chronic obstructive pulmonary disease (COPD) and Global Initiative for Chronic Obstructive Lung Disease (GOLD) 2017 standard in screening COPD among the residents over 60 years old in Yibin. Methods From January to December 2019, 744 residents over 60 years old were selected from Yibin by multi-stage sampling, and they were diagnosed by symptom-based questionnaire for identifying COPD and pulmonary function test respectively. The consistency of two methods was compared in diagnosing COPD. Results With a score of symptom-based questionnaire for identifying COPD of 16. 5 or 19. 5, a total of 127 or 86 residents were diagnosed as COPD with a detection rate of 17. 1% or 11. 6% respectively. There was significant difference in the detection rate of COPD among the residents with different age, body mass index (BMI) or smoking state(P<0. 05). Eighty-one cases were diagnosed as COPD by pulmonary function according to GOLD 2017 with a prevalence of 10. 9%, and significant differences were observed among the residents with different age and smoking (P<0. 05). With GOLD 2017 as the golden standard, symptom-based questionnaire for identifying COPD score with 16. 5 or 19. 5 as cut-off showed a kappa of 0. 512 and 0. 791, sensitivity of 74. 1% and 84. 0%, specificity of 89. 9% and 97. 3%, respectively. Conclusions Symptom-based questionnaire for identifying COPD is suitable for COPD screening among the residents over 60 years old. Taking 19. 5 as cut-off for diagnosing COPD can accurately reflect the lung function of individuals, with high consistency, sensitivity and specificity.

Key words: chronic obstructive pulmonary disease, symptom-based questionnaire for identifying COPD, pulmonary function, consistency