Sleep Heart Health Study

Variable created as part of the analysis for Tung et al. 2017 (PMID: 28668820). Incident AF was considered present if AF was identified on a 12-lead ECG obtained at the second SHHS exam or was adjudicated by the parent cohorts at any time between the baseline PSG and the final follow-up date for AF ascertainment of June 30, 2006.

Variable created as part of the analysis for Tung et al. 2017 (PMID: 28668820). Prevalent AF was defined by any of the following: a positive response to the question 'Has a doctor ever told you that you have or had atrial fibrillation'; AF identified on resting 12-lead ECG at the baseline SHHS exam; or if the parent study identified AF documented in the medical record before the SHHS baseline exam.

Angina episodes since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Any Coronary Heart Disease (CHD) since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Any Cardiovascular Disease (CVD) since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

coronary artery bypass graft surgery (CABG) since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Coronary Heart Disease (CHD) death (as recorded in parent studies datasets)

Congestive Heart Failure (CHF) since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Cardiovascular Disease (CVD) death (as recorded in parent studies datasets)

Myocardial infarction (MI) since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Fatal myocardial infarction (MI) since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Myocardial infarction (MI) procedure since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Angina episodes prior to baseline Polysomnography (PSG) (as recorded in parent studies datasets)

Congestive Heart Failure (CHF) episodes prior to baseline Polysomnography (PSG) (as recorded in parent studies datasets)

Myocardial infarction (MI) prior to baseline Polysomnography (PSG) (as recorded in parent studies datasets)

Myocardial infarction (MI)/procedure prior to baseline Polysomnography (PSG) (as recorded in parent studies datasets)

Revascularization procedure prior to baseline Polysomnography (PSG) (as recorded in parent studies datasets)

Stroke prior to baseline Polysomnography (PSG) (as recorded in parent studies datasets)

Percutaneous transluminal coronary angioplasty (PTCA) since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Revascularization procedure since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Fatal stroke since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Stroke since baseline Polysomnogram (PSG) (as recorded in parent studies datasets)

Deaths from any cause were identified and confirmed for the cohort using multiple concurrent approaches including follow-up interviews, written annual questionnaires or telephone contacts with study participants or next-of-kin, surveillance of local hospital records and community obituaries, and linkage with the Social Security Administration Death Master File. (For more information, see Punjabi et al. 2009 (PMID: 19688045))

Age at time of study in years, based on start date of Sleep Heart Health Study Visit One (SHHS1) Polysomnography (PSG) recording.

Age at time of study in years, based on start date of Sleep Heart Health Study Visit One (SHHS1) Polysomnography (PSG) recording.

Age at time of study in years, based on start date of Sleep Heart Health Study Visit One (SHHS1) Polysomnography (PSG) recording.

Age in years at the time of the Sleep Heart Health Study Visit Two (SHHS2) visit

Note: This variable was derived from race and was not asked as a separate demographic question. At the time of SHHS Visit 1, race and ethnicity were collected together in a single question. This variable was derived later on when the datasets were prepared for deposition in Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC).

Gender as reported by Parent Cohort

This subject identifier was created by the National Sleep Research Resource (NSRR) team to more easily match with file downloads. Use 'pptid' to link with Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC) and cohort-specific data.

This participant ID matches what is present in Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC).

Race is presented as three (3) categories based on suggested Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC) de-identification procedures.

Body Mass Index (BMI) at Sleep Heart Health Study Visit One (SHHS1)

Body Mass Index (BMI) at Sleep Heart Health Study Visit Two (SHHS2)

The SHHS Coordinating Center bottom and top coded this variable using a lower limit of 145 centimeters and an upper limit of 188 centimeters.

Hip measurement in centimeters

The SHHS Coordinating Center bottom and top coded this variable using a lower limit of 47 kilograms and an upper limit of 126 kilograms.

The SHHS Coordinating Center bottom and top coded this variable using a lower limit of 145 centimeters and an upper limit of 188 centimeters.

Waist measurement in centimeters

The SHHS Coordinating Center bottom and top coded this variable using a lower limit of 47 kilograms and an upper limit of 126 kilograms.

Average of 2nd and 3rd Diastolic Blood Pressure (BP) measures

Average of 2nd and 3rd Systolic Blood Pressure (BP) measures

Seated Diastolic Blood Pressure (BP)

Seated Systolic Blood Pressure (BP) (Average of two measurements)

in One Second

Total number of arousals per hour of sleep. Ratio of count of arousals to total sleep time in hours.

Lowest oxygen saturation (SaO2)% during sleep

Obstructive apnea (all desaturations) hypopnea (>=4% desaturation) index

Ratio of the count of all apneas (central and obstructive) and hypopneas associated with at least a >=4% oxygen desaturation to the total sleep time expressed in hours

Overall study grade as assigned by scorer. These codes reflected the total duration of useable (artifact free, scorable) signals during sleep time across channels, weighing those signals most critical for accurate scoring of respiratory events and staging during sleep time. The Quality Assessment Form for SHHS2 was modified so that the overall quality grade and the signal quality codes were based on signals during sleep time. Since events were only scored during sleep time this provided a more accurate assessment of signal quality during the actual time or scoring. This change would only have affected the quality grade of a small number of studies in SHHS1 where there was a significant amount of time awake with very good signals combined with very poor signals that occurred during sleep. The overall and signal quality grades are comparable between SHHS1 and SHHS2.

Percent of sleep time in non-supine body position

Ratio of the number of minutes with oxygen saturation (SaO2) under 90% to the total sleep time expressed in hours.

Percentage of time in bed that was spent sleeping, or the ratio of total sleep time to total time in bed, expressed as a percentage.

Time from lights out time to beginning of sleep, rounded to nearest minute

Total amount of time spent awake after going to sleep

Usual Alcohol Intake per day

Lifetime cigarette smoking: pack years

1. Has a doctor ever told you that you have the following? a. Emphysema

1. Has a doctor ever told you that you have the following? b. Chronic bronchitis

1. Has a doctor ever told you that you have the following? c. chronic obstructive pulmonary disease (COPD)

1. Has a doctor ever told you that you have the following? d. Asthma

e. Do you still have asthma?

16. Has a doctor ever told you that you have the following? restless leg syndrome (RLS)?