Airflow Limitation (pre FEV1/FVC<70 only)
This variable is based on the empirical evidence from the spirometry that the ratio of FEV1 to FVC is below the level defined by the ATS as indicative of restricted airflow. Defined only for valid spirometries.
- 0: No
- 1: Yes
Airflow Limitation (pre FEV1/FVC<70 only) vs Visit Number
Airflow Limitation (pre FEV1/FVC<70 only) vs Gender