postbd_prebd_diff valid_spirometry
Name
postbd_prebd_diff_gt12_v2
Label
Post(FEV1%pred)-Pre(FEV1%pred)>=12% (pre FEV1/FVC<70 only)
Description

This variable is based on the ratio of the measured FEV1 difference from postbronchodilator and pre-bronchodilator exams over the Predicted FEV1 calculated prebronch (both values must be non-missing, and the post-bronchodilator spirometry examination must be valid) among participants with pre FEV1/FVC<70 only (ignores LLN comparison).

Type
numeric
Visit Number vs Post(FEV1%pred)-Pre(FEV1%pred)>=12% (pre FEV1/FVC<70 only)
N Mean StdDev Median Min Max Unknown Total
Baseline 792 0.1 ± 0.3 0.0 0.0 1.0 15,623 16,415
Sueño Ancillary - - - - - - - -
Gender vs Post(FEV1%pred)-Pre(FEV1%pred)>=12% (pre FEV1/FVC<70 only)
Baseline
N Mean StdDev Median Min Max Unknown Total
Total 792 0.1 ± 0.3 0.0 0.0 1.0 13,363 14,155
Female 357 0.1 ± 0.3 0.0 0.0 1.0 8,001 8,358
Male 435 0.08 ± 0.3 0.0 0.0 1.0 5,362 5,797