copd_by_bd copd_ever
Name
copd_by_bd_allpre
Label
COPD by BD Test (for all valid PRE_BD)
Description

This variable is based on the post-bronchodilator measurement of the FEV1 to FVC ratio. The airflow remains restricted after the administration of albuterol. This variable is also defined for all participants who did not conduct a post-spirometry exam. Defined only for valid spirometries.

Domain
noyes01
  • 0: No
  • 1: Yes
Type
choices
COPD by BD Test (for all valid PRE_BD) vs Visit Number
Baseline Sueño Ancillary
Total 16,415 -
No 12,605 -
Yes 440 -
Unknown 3,370 -
COPD by BD Test (for all valid PRE_BD) vs Gender
Baseline
Female Male Total
Total 8,358 5,797 14,155
No 7,521 5,084 12,605
Yes 176 264 440
Unknown 661 449 1,110