Peak expiratory flow is a direct measurement of the airway obstruction and lung function, and it has been used to evaluate the effects of different factors, including medical treatment and air pollution exposure, on airway caliber. The peak expiratory flow measurements at baseline in the studied population were 418 L/min for men and 292 L/min for women, which were lower than the normal range for both men (500–700 L/min) and women (380–500 L/min)(Cross and Nelson, 1991). Long-term exposure to polluted air may have resulted in the poor status of the airways and explains the relative low baseline peak expiratory
flow. The low peak expiratory flow also could be partly due to the early morning measurements in this study, which tended to be the lowest level of an entire day. Compared to a Western population, subjects included in this study might have relatively smaller body size in terms of height and weight, as well as higher smoking prevalence in male participants. This may also contribute to the low baseline levels because the absolute peak expiratory flow is also associated with race, age, height, and smoking status (Gregg and Nunn, 1973).
Peak expiratory flow is a direct measurement of the airway obstruction and lung function, and it has been used to evaluate the effects of different factors, including medical treatment and air pollution exposure, on airway caliber. The peak expiratory flow measurements at baseline in the studied population were 418 L/min for men and 292 L/min for women, which were lower than the normal range for both men (500–700 L/min) and women (380–500 L/min)(Cross and Nelson, 1991). Long-term exposure to polluted air may have resulted in the poor status of the airways and explains the relative low baseline peak expiratoryflow. The low peak expiratory flow also could be partly due to the early morning measurements in this study, which tended to be the lowest level of an entire day. Compared to a Western population, subjects included in this study might have relatively smaller body size in terms of height and weight, as well as higher smoking prevalence in male participants. This may also contribute to the low baseline levels because the absolute peak expiratory flow is also associated with race, age, height, and smoking status (Gregg and Nunn, 1973).
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