Table 1
Spirometric definitions of airflow obstruction used in study

Table 1
Spirometric definitions of airflow obstruction used in study
Table summary
This table displays the results of Spirometric definitions of airflow obstruction used in study. The information is grouped by Pre-bronchodilator spirometry-based measures of airflow obstruction (appearing as row headers), GOLD stage (appearing as column headers).
Pre-bronchodilator spirometry-based measures of airflow obstruction GOLD stage
FEV1 / FVC < 0.70 GOLD I or higher (fixed ratio)
FEV1 / FVC < 0.70; FEV1 < 80% predicted GOLD II or higher
FEV1 / FVC < 0.70; FEV1 ≥ 80% predicted GOLD I
FEV1 / FVC < 0.70; 50% ≤ 50% FEV1 < 80% predicted GOLD II
FEV1 / FVC < 0.70; FEV1 < 50% predicted GOLD III and IV
FEV1 / FVC < LLN Non-GOLD staging criteria
FEV1 / FVC < LLN; FEV1 < LLN Non-GOLD staging criteria
FEV1 = forced expiratory volume in one second
FVC = forced vital capacity
LLN = lower limit of normal
% = percent predicted (NHANES III)Note16
GOLD = Global Initiative for Chronic Obstructive Lung DiseaseNote20
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