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Ratio of the number of central apneas with no oxygen desaturation threshold used and with or without arousal to the number of obstructive apneas with no oxygen desaturation threshold used and with or without arousal from type I polysomnography

cent_obs_ratio under Sleep Monitoring/Polysomnography/Respiratory Event Counts in CFS variables

Ratio of the number of central apneas with no oxygen desaturation threshold used or with arousal to the number of obstructive apneas with no oxygen desaturation threshold used or with arousal from type I polysomnography

cent_obs_ratioa under Sleep Monitoring/Polysomnography/Respiratory Event Counts in CFS variables

Has a doctor or other health care provider ever told you that you had COPD, chronic obstructive lung disease, or emphysema?

mhcobpd under Medical History in MROS variables

Are you currently being treated for COPD, chronic obstructive lung disease, or emphysema?

mhcobpdt under Medical History in MROS variables

Number of bradycardia related to obstructive apnea

ponobro under Sleep Monitoring/Polysomnography/Heart Rate in MROS variables

Number of tachycardia related to obstructive apnea

ponotco under Sleep Monitoring/Polysomnography/Heart Rate in MROS variables

Emphysema or Chronic Obstructive Pulmonary Disease (COPD): Self-reported diagnosis by a physician

dxcopd under Medical History in HEARTBEAT variables

Chronic Obstructive Pulmonary Disease: Self-reported

mdhx_5810 under Medical History in STAGES variables

Minimum level of oxygen saturation (nadir) associated with obstructive apneas in total estimated sleep duration from type III home sleep apnea test

minlvlnd_oa0n_f1t3 under Sleep Monitoring/Polysomnography/Oxygen Saturation in NUMOM2B variables

"Nadir" refers to the lowest oxygen saturation reading

Percentage of estimated sleep duration in central and obstructive apneas from type III home sleep apnea test

pctdursp_ap0n_f1t3 under Sleep Monitoring/Polysomnography/Respiratory Event Lengths in NUMOM2B variables

Estimated sleep duration, providing an approximation of total sleep duration (i.e. total sleep time) inferred from analysis of non-EEG channels Zhao et al., 2017 (PMID:27707441)

Percentage of estimated sleep duration in central and obstructive apneas with >= 3% oxygen desaturation or hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation from type III home sleep apnea test

pctdursp_ap3nhp3x3n_f1t3 under Sleep Monitoring/Polysomnography/Respiratory Event Lengths in NUMOM2B variables

Estimated sleep duration, providing an approximation of total sleep duration (i.e. total sleep time) inferred from analysis of non-EEG channels Zhao et al., 2017 (PMID:27707441)

Obstructive Lung Disease suspect

airflow_obstruction under Clinical Data/Diagnostic Studies/Lung Function in HCHS variables

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.

Has a doctor or other health care provider ever told you that you have chronic obstructive lung disease (COPD), chronic bronchitis, asthma, emphysema?

v6scopd under Medical History in SOF variables

This variable was collected at visit 6, a different timepoint than the 'Visit 8' sleep variables

Has a doctor or other health care provider ever told you that you have chronic obstructive lung disease (COPD), chronic bronchitis, asthma, emphysema?

v8ecopd under Medical History in SOF variables

cent_obs_ratio under Sleep Monitoring/Polysomnography/Respiratory Event Counts in SOF variables

cent_obs_ratioa under Sleep Monitoring/Polysomnography/Respiratory Event Counts in SOF variables

Total number of obstructive apneas with no oxygen desaturation threshold used and with or without arousal during REM sleep in non-supine position from type II polysomnography

oarop under Sleep Monitoring/Polysomnography/Respiratory Event Counts in SOF variables

Total duration of all central and obstructive apneas from type II polysomnography

aptdur under Sleep Monitoring/Polysomnography/Respiratory Event Lengths in SOF variables

entire recording

Average duration of obstructive apnea from type II polysomnography

oavgdur under Sleep Monitoring/Polysomnography/Respiratory Event Lengths in SOF variables

entire recording

Total duration of obstructive apnea in NREM sleep from type II polysomnography

ontdur under Sleep Monitoring/Polysomnography/Respiratory Event Lengths in SOF variables

Total duration of obstructive apnea in NREM sleep in supine position from type II polysomnography

ontdurbp under Sleep Monitoring/Polysomnography/Respiratory Event Lengths in SOF variables

Total duration of obstructive apnea in NREM sleep in non-supine position from type II polysomnography

ontdurop under Sleep Monitoring/Polysomnography/Respiratory Event Lengths in SOF variables

Total duration of obstructive apnea in REM sleep in non-supine position from type II polysomnography

ortdurop under Sleep Monitoring/Polysomnography/Respiratory Event Lengths in SOF variables

Total duration of obstructive apnea from type II polysomnography

otdur under Sleep Monitoring/Polysomnography/Respiratory Event Lengths in SOF variables

entire recording

Percentage of total sleep duration with obstructive apneas with no oxygen desaturation threshold used and with or without arousal from type II polysomnography

pslp_oa0 under Sleep Monitoring/Polysomnography/Sleep Architecture in SOF variables