Abstract
Objective: To investigate the pulmonary ventilation indices such as FVC, FEV1, FEV1/FVC, PEF, FEF25-75% by spirometer and the degree of ventilation disorder in asymptomatic smokers. Determining the relationship between some pulmonary ventilation indices with smoking time and smoking level in these subjects. Subjects and methods: 128 men in Huong Ho ward, Huong Tra town, Thua Thien Hue province participated in a cross-sectional descriptive study with comparison with the control group during the period from April 2020 to April/2022. Results: There was a significant difference in the two indices FEV1/FVC (%) and FEF25-75% (%) between the smoking group and the smoking group (p <0,05). The mean values of the pulmonary ventilation indices decreased gradually with the level of smoking and the difference was significant between the groups (p <0,05). The mean values of pulmonary ventilation indexes decreased gradually with smoking time and the significant difference between the groups. (p <0,05).