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Hispanic Community Health Study / Study of Latinos

Name Label Folder
airflow_limitation
Airflow Limitation (pre FEV1/FVC<70 only)
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.

Respiratory
airflow_obstruction
Obstructive Lung Disease suspect
Obstructive Lung Disease suspect

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.

Respiratory
asthma_c4
4-level grouped Asthma Status
4-level grouped Asthma Status Respiratory
asthma_c4_md
4-level grouped Asthma Status - by MD diagnosis
4-level grouped Asthma Status - by MD diagnosis Respiratory
asthma_curr
Current Asthma
Current Asthma Respiratory
asthma_curr_md
Currently have asthma with ever MD diagnosis
Currently have asthma with ever MD diagnosis Respiratory
asthma_ever
Ever had Asthma (self-report)
Ever had Asthma (self-report) Respiratory
asthma_ever_md
Ever had asthma with MD diagnosis
Ever had asthma with MD diagnosis Respiratory
asthma_meds
Asthma Med Use - self/scanned (curr asthma by MD diag)
Asthma Med Use - self/scanned (curr asthma by MD diag)

This variable combines scanned/transcribed anti-asthmatic medication use with self-report asthma medication use.

Respiratory
bd_response_abs
Bronchodilator Responsive by 15% change
Bronchodilator Responsive by 15% change

This variable is based on the post-bronchodilator measurement of the FEV1. The airflow remains restricted after the administration of albuterol the person did not respond by greater than a 15% improvement over their first measurement. If PRBA29 is not missing and POBA29 is not missing and PRBA29 > 0 then.

Respiratory
copd_by_bd
COPD by BD Test
COPD by BD Test

This indicator of COPD is based on the post-bronchodilator measurement of the FEV1 to FVC ratio. The airflow remains restricted after the administration of albuterol.

Respiratory
copd_by_bd_allpre
COPD by BD Test (for all valid PRE_BD)
COPD by BD Test (for all valid PRE_BD)

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.

Respiratory
copd_ever
Self-report of ever had COPD/Emph or CB
Self-report of ever had COPD/Emph or CB Respiratory
copd_meds
COPD Med Use - self/scanned (ever COPD by MD diag)
COPD Med Use - self/scanned (ever COPD by MD diag)

This variable combines scanned/transcribed anti-asthmatic medication use with self-report COPD medication use.

Respiratory
copd_self
Self-report of ever had COPD/Emph
Self-report of ever had COPD/Emph Respiratory
fev1_fvc_ratio
FEV1/FVC Ratio
FEV1/FVC Ratio

This variable is the ratio of forced expiratory volume in one minute (FEV1 ) to forced vital capacity (FVC) expressed as a percentage.

Respiratory
mrc_cb
Chronic Productive Cough 3+ mths in 2+ yrs
Chronic Productive Cough 3+ mths in 2+ yrs Respiratory
phlegm
Phlegm day/night 3 months in a row
Phlegm day/night 3 months in a row Respiratory
pneumonia
Pneumonia
Pneumonia Respiratory
postbd_expected
Post-BD Expected (among valid spirometry
Post-BD Expected (among valid spirometry

This variable is a flag for whether a post bronchodilator was expected, based on the premeasurement. A post measurement was expected if the FEV1 to FVC ratio was less than 70% or less than the lower limit of normal for FEV1/FVC%.

Respiratory
postbd_prebd_diff
Post(FEV1%pred)-Pre(FEV1%pred)
Post(FEV1%pred)-Pre(FEV1%pred)

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 examinations must be valid).

Respiratory
postbd_prebd_diff_gt12_v2
Post(FEV1%pred)-Pre(FEV1%pred)>=12% (pre FEV1/FVC<70 only)
Post(FEV1%pred)-Pre(FEV1%pred)>=12% (pre FEV1/FVC<70 only)

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).

Respiratory
valid_spirometry
Valid Spirometry Studies (Pre)
Valid Spirometry Studies (Pre)

This variable is an overall data quality indicator derived by the pulmonary reading center on the adequacy study for use.

Respiratory
valid_spirometry_postbd
Valid Spirometry Studies (Post BD)
Valid Spirometry Studies (Post BD)

This variable is an overall data quality indicator derived by the pulmonary reading center on the adequacy study for use.

Respiratory
valid_spirometry_postbd_v2
Valid post-spirometry (A-D grading) adjusted for unexpected BDs
Valid post-spirometry (A-D grading) adjusted for unexpected BDs

This variable is a flag for whether a post bronchodilator was valid (grade A-D). Defined only for participants where a post measurement was expected.

Respiratory
wheeze_last12
Wheezing in last 12 months
Wheezing in last 12 months Respiratory
wheeze_sb
Wheezing ever with shortness of breath
Wheezing ever with shortness of breath Respiratory