folder,id,display_name,description,type,units,domain,labels,calculation,commonly_used,forms
Administrative,daystomonth09,Days from baseline to 9-month visit,"",numeric,days,"","","","",""
Administrative,daystomonth18,Days from baseline to 18-month visit,"",numeric,days,"","","","",""
Administrative,daystosurgery,Days from baseline to laparoscopic gastric banding (LGB) surgery,"",numeric,days,"","","","",""
Administrative,nsrrid,NSRR subject identifier,The National Sleep Research Resource (NSRR) subject identifier links the subject's data and files.,identifier,"","","","",true,""
Administrative,rand_siteid,Site identifier,Recruitment site was a stratification factor for randomization.,choices,"",siteid,"","",true,""
Administrative,rand_treatmentarm,Randomized treatment arm,"",choices,"",treatment_arm,"","",true,""
Administrative,surgery_occurred,Surgery occurred,The subject underwent laparoscopic gastric banding (LGB) surgery.,choices,"",noyes,"","","",""
Administrative,visitnumber,Visit number,"",choices,"",visitnumber,"","",true,""
Anthropometry,bmi,Body mass index (BMI),Calculated,numeric,kilograms per meter squared (kg/m2),"","","",true,""
Anthropometry,height,Height,"",numeric,centimeters (cm),"","","","",""
Anthropometry,weight,Weight,"",numeric,kilograms (kg),"","","","",""
Demographics,age,Age of the participant,"",numeric,years,"","","",true,""
Demographics,ethnicity,Ethnicity (Hispanic or Latino) of the participant,"""Hispanic or Latino"" is defined as a person of Cuban, Mexican, Puerto Rican, South or Central American or other Spanish culture or origin regardless of race.",choices,"",ethnicity,race,"",true,""
Demographics,gender,Gender of the participant,"",choices,"",gender,"","",true,""
Demographics,race,Race of the participant,Race is presented as three (3) categories based on [suggested Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC) de-identification procedures](http://www.nhlbi.nih.gov/research/funding/human-subjects/set-preparation-guidelines).,choices,"",race,"","",true,""
Polysomnography (PSG),ahi_ap0uhp3x3r,Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of sleep,"Calculated - Summary metric of sleep disordered breathing events. The definition for hypopneas is consistent with the following clinical guidelines: (1) American Academy of Sleep Medicine (AASM) 2007 Manual (2012 update) (recommended). [Berry RB et al. 2012 (PubMed ID:23066376)](https://www.ncbi.nlm.nih.gov/pubmed/23066376), and (2) American Academy of Sleep Medicine (AASM) 2015 (recommended) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.]
[Search for all AHI variables consistent with the same clinical guidelines within this dataset](https://sleepdata.org/datasets/abc/variables?search=aasm15_recommended)",numeric,events per hour,"",ahi_a0h3a;ahi_a0uh3x3r;aasm15_recommended,60 * (hremba3 + hroa3 + hnrba3 + hnroa3 + urbpa3 + uropa3 + unrbpa3 + unropa3 + carbp + carop + canbp + canop + oarbp + oarop + oanbp + oanop ) / ttldursp,"",""
Polysomnography (PSG),ahi_ap0uhp3x3u,Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of sleep,Calculated - Summary metric of sleep disordered breathing events.,numeric,events per hour,"",ahi_a0h3;ahi_a0uh3x3u,60 * (hrembp3 + hrop3 + hnrbp3 + hnrop3 + urbp3 + urop3 + unrbp3 + unrop3 + carbp + carop + canbp + canop + oarbp + oarop + oanbp + oanop) / ttldursp,true,""
Polysomnography (PSG),ahi_ap0uhp3x4r,Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation or with arousal) / hour of sleep,Calculated - Summary metric of sleep disordered breathing events.,numeric,events per hour,"",ahi_a0h4a;ahi_a0uh3x4r,60 * (hremba4 + hroa4 + hnrba4 + hnroa4 + urbpa4 + uropa4 + unrbpa4 + unropa4 + carbp + carop + canbp + canop + oarbp + oarop + oanbp + oanop / ttldursp,"",""
Polysomnography (PSG),ahi_ap0uhp3x4u,Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation and with or without arousal) / hour of sleep,"Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the following clinical guidelines: (1) AASM 2012 update (alternative) [Berry RB et al. 2012 (PubMed ID:23066376)] (https://www.ncbi.nlm.nih.gov/pubmed/23066376), and (2) AASM 2015 (acceptable) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.].
[Search for all AHI variables consistent with the same clinical guidelines within this dataset](https://sleepdata.org/datasets/abc/variables?search=aasm15_acceptable)",numeric,events per hour,"",ahi_a0h4;ahi_a0uh3x4u;aasm15_acceptable,60 * (hrembp4 + hrop4 + hnrbp4 + hnrop4 + urbp4 + urop4 + unrbp4 + unrop4 + carbp + carop + canbp + canop + oarbp + oarop + oanbp + oanop ) / ttldursp,true,""
Polysomnography (PSG),avglvlhr,Average heart rate during total sleep duration,"",numeric,beats per minute (bpm),"",bpmavg;avghr,"","",""
Polysomnography (PSG),avglvlsa,Average oxygen saturation level in total sleep duration,"",numeric,percent (%),"",avgsat,"","",""
Polysomnography (PSG),cahi_ca0uhp3x3r,Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 3% desaturation or with arousal) / hour of sleep,"Calculated - Summary metric of sleep disordered breathing events. The definition for hypopneas is consistent with the following clinical guidelines: (1) American Academy of Sleep Medicine (AASM) 2007 Manual (2012 update) (recommended). [Berry RB et al. 2012 (PubMed ID:23066376)] (https://www.ncbi.nlm.nih.gov/pubmed/23066376), and (2) American Academy of Sleep Medicine (AASM) 2015 (recommended) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.]
[Search for all AHI variables consistent with the same clinical guidelines within this dataset](https://sleepdata.org/datasets/abc/variables?search=aasm15_recommended)",numeric,events per hour,"",ahi_c0h3a;cahi_c0uh3x3r;aasm15_recommended,60 * (hremba3 + hroa3 + hnrba3 + hnroa3 + urbpa3 + uropa3 + unrbpa3 + unropa3 + carbp + carop + canbp + canop) / ttldursp,"",""
Polysomnography (PSG),cahi_ca0uhp3x3u,Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 3% desaturation and with or without arousal) / hour of sleep,Calculated - Summary metric of sleep disordered breathing events.,numeric,events per hour,"",ahi_c0h3;cahi_c0uh3x3u,60 * (hrembp3 + hrop3 + hnrbp3 + hnrop3 + urbp3 + urop3 + unrbp3 + unrop3 + carbp + carop + canbp + canop) / ttldursp,"",""
Polysomnography (PSG),cahi_ca0uhp3x4r,Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 4% desaturation or with arousal) / hour of sleep,Calculated - Summary metric of sleep disordered breathing events.,numeric,events per hour,"",ahi_c0h4a;cahi_c0uh3x4r,60 * (hremba4 + hroa4 + hnrba4 + hnroa4 + urbpa4 + uropa4 + unrbpa4 + unropa4 + carbp + carop + canbp + canop) / ttldursp,"",""
Polysomnography (PSG),cahi_ca0uhp3x4u,Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 4% desaturation and with or without arousal) / hour of sleep,"Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the following clinical guidelines: (1) AASM 2012 update (alternative) [Berry RB et al. 2012 (PubMed ID:23066376)](https://www.ncbi.nlm.nih.gov/pubmed/23066376), and (2) AASM 2015 (acceptable) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.].
[Search for all AHI variables consistent with the same clinical guidelines within this dataset](https://sleepdata.org/datasets/abc/variables?search=aasm15_acceptable)",numeric,events per hour,"",ahi_c0h4;cahi_c0uh3x4u;aasm15_acceptable,60 * (hrembp4 + hrop4 + hnrbp4 + hnrop4 + urbp4 + urop4 + unrbp4 + unrop4 + carbp + carop + canbp + canop) / ttldursp,"",""
Polysomnography (PSG),cai_ca0u,Central Apnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal) / hour of sleep,Calculated - Summary metric of sleep disordered breathing events.,numeric,events per hour,"",cai_c0,60 * (carbp + carop + canbp + canop) / ttldursp,"",""
Polysomnography (PSG),hi_hp3x0u,Hypopnea Index: (hypopneas with > 30% flow reduction and with no oxygen desaturation threshold used and with or without arousal) / hour of sleep,Calculated - Summary metric of sleep disordered breathing events.,numeric,events per hour,"",hi_h0;hi_h3x0u,60 * (hrembp + hrop + hnrbp + hnrop + urbp + urop + unrbp + unrop) / ttldursp,"",""
Polysomnography (PSG),minlvlsa,Minimum oxygen saturation level in total sleep duration,"",numeric,percent (%),"",minsat,"","",""
Polysomnography (PSG),oahi_oa0uhp3x3r,Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of sleep,"Calculated - Summary metric of sleep disordered breathing events. The definition for hypopneas is consistent with the following clinical guidelines: (1) American Academy of Sleep Medicine (AASM) 2007 Manual (2012 update) (recommended). [Berry RB et al. 2012 (PubMed ID:23066376)](https://www.ncbi.nlm.nih.gov/pubmed/23066376), and (2) American Academy of Sleep Medicine (AASM) 2015 (recommended) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.]
[Search for all AHI variables consistent with the same clinical guidelines within this dataset](https://sleepdata.org/datasets/abc/variables?search=aasm15_recommended)",numeric,events per hour,"",ahi_o0h3a;oahi_o0uh3x3r;aasm15_recommended,60 * (hremba3 + hroa3 + hnrba3 + hnroa3 + urbpa3 + uropa3 + unrbpa3 + unropa3 + oarbp + oarop + oanbp + oanop) / ttldursp,"",""
Polysomnography (PSG),oahi_oa0uhp3x3u,Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of sleep,Calculated - Summary metric of sleep disordered breathing events.,numeric,events per hour,"",ahi_o0h3;oahi_o0uh3x3u,60 * (hrembp3 + hrop3 + hnrbp3 + hnrop3 + urbp3 + urop3 + unrbp3 + unrop3 + oarbp + oarop + oanbp + oanop) / ttldursp,"",""
Polysomnography (PSG),oahi_oa0uhp3x4r,Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation or with arousal) / hour of sleep,Calculated - Summary metric of sleep disordered breathing events.,numeric,events per hour,"",ahi_o0h4a;oahi_o0uh3x4r,60 * (hremba4 + hroa4 + hnrba4 + hnroa4 + urbpa4 + uropa4 + unrbpa4 + unropa4 + oarbp + oarop + oanbp + oanop) / ttldursp,"",""
Polysomnography (PSG),oahi_oa0uhp3x4u,Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation and with or without arousal) / hour of sleep,"Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the following clinical guidelines: (1) AASM 2012 update (alternative) [Berry RB et al. 2012 (PubMed ID:23066376)](https://www.ncbi.nlm.nih.gov/pubmed/23066376), and (2) AASM 2015 (acceptable) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.].
[Search for all AHI variables consistent with the same clinical guidelines within this dataset](https://sleepdata.org/datasets/abc/variables?search=aasm15_acceptable)",numeric,events per hour,"",ahi_o0h4;oahi_o0uh3x4u;aasm15_acceptable,60 * (hrembp4 + hrop4 + hnrbp4 + hnrop4 + urbp4 + urop4 + unrbp4 + unrop4 + oarbp + oarop + oanbp + oanop) / ttldursp,"",""
Polysomnography (PSG),oai_oa0u,Obstructive Apnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal) / hour of sleep,Calculated - Summary metric of sleep disordered breathing events.,numeric,events per hour,"",oai_o0;oai_o0u,60 * (oarbp + oarop + oanbp + oanop) / ttldursp,"",""
Polysomnography (PSG),pctdursp_o75,Percent of total sleep duration with oxygen saturation < 75%,"Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.",numeric,percent (%),"",pctlt75;slppcto2lt75,"","",""
Polysomnography (PSG),pctdursp_o80,Percent of total sleep duration with oxygen saturation < 80%,"Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.",numeric,percent (%),"",pctlt80;slppcto2lt80,"","",""
Polysomnography (PSG),pctdursp_o85,Percent of total sleep duration with oxygen saturation < 85%,"Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.",numeric,percent (%),"",pctlt85;slppcto2lt85,"","",""
Polysomnography (PSG),pctdursp_o90,Percent of total sleep duration with oxygen saturation < 90%,"Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.",numeric,percent (%),"",pctlt90;slppcto2lt90,"",true,""
Polysomnography (PSG),pctdursp_s1,Percent of total sleep duration in stage 1 sleep,"Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.",numeric,percent (%),"",timest1p;slppctn1,"","",""
Polysomnography (PSG),pctdursp_s2,Percent of total sleep duration in stage 2 sleep,"Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.",numeric,percent (%),"",timest2p;slppctn2,"","",""
Polysomnography (PSG),pctdursp_s3,Percent of total sleep duration in stage 3 - 4 sleep,"Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.",numeric,percent (%),"",times34p;slppctn3,"","",""
Polysomnography (PSG),pctdursp_sr,Percent of sleep time in REM sleep,"",numeric,percent (%),"",timeremp;slppctrem,"","",""
Polysomnography (PSG),ttldursp,Total sleep duration,"Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time",numeric,minutes,"",slpprdp;ttldursp,"",true,""
Polysomnography (PSG),ttldursp_s1,Total sleep duration in stage 1 sleep,"",numeric,minutes,"",timest1;slptimen1,"","",""
Polysomnography (PSG),ttldursp_s2,Total sleep duration in stage 2 sleep,"",numeric,minutes,"",timest2;slptimen2,"","",""
Polysomnography (PSG),ttldursp_s3,Total sleep duration in stage 3 - 4 sleep,"",numeric,minutes,"",timest34;slptimen34,"","",""
Polysomnography (PSG),ttldursp_sr,Total sleep duration in REM sleep,"",numeric,minutes,"",timerem;slptimerem,"","",""
Questionnaires/Epworth Sleepiness Scale (ESS),ess_1sitread,Epworth Sleepiness Scale: Chance of dozing while sitting and reading,Item from the Epworth Sleepiness Scale [Johns MW 1991 (PubMed ID: 1798888)](https://www.ncbi.nlm.nih.gov/pubmed/1798888)
[Search for all ESS variables within this dataset](https://sleepdata.org/datasets/abc/variables?search=epworth),choices,"",epworth,ess,"","",""
Questionnaires/Epworth Sleepiness Scale (ESS),ess_2watchingtv,Epworth Sleepiness Scale: Chance of dozing while watching TV,Item from the Epworth Sleepiness Scale [Johns MW 1991 (PubMed ID: 1798888)](https://www.ncbi.nlm.nih.gov/pubmed/1798888)
[Search for all ESS variables within this dataset](https://sleepdata.org/datasets/abc/variables?search=epworth),choices,"",epworth,ess,"","",""
Questionnaires/Epworth Sleepiness Scale (ESS),ess_3sitinactive,"Epworth Sleepiness Scale: Chance of dozing while sitting, inactive in a public place",Item from the Epworth Sleepiness Scale [Johns MW 1991 (PubMed ID: 1798888)](https://www.ncbi.nlm.nih.gov/pubmed/1798888)
[Search for all ESS variables within this dataset](https://sleepdata.org/datasets/abc/variables?search=epworth),choices,"",epworth,ess,"","",""
Questionnaires/Epworth Sleepiness Scale (ESS),ess_4passenger,Epworth Sleepiness Scale: Chance of dozing as a passenger in a car for an hour without a break,Item from the Epworth Sleepiness Scale [Johns MW 1991 (PubMed ID: 1798888)](https://www.ncbi.nlm.nih.gov/pubmed/1798888)
[Search for all ESS variables within this dataset](https://sleepdata.org/datasets/abc/variables?search=epworth),choices,"",epworth,ess,"","",""
Questionnaires/Epworth Sleepiness Scale (ESS),ess_5lyingdown,Epworth Sleepiness Scale: Chance of dozing while lying down in the afternoon when circumstances permit,Item from the Epworth Sleepiness Scale [Johns MW 1991 (PubMed ID: 1798888)](https://www.ncbi.nlm.nih.gov/pubmed/1798888)
[Search for all ESS variables within this dataset](https://sleepdata.org/datasets/abc/variables?search=epworth),choices,"",epworth,ess,"","",""
Questionnaires/Epworth Sleepiness Scale (ESS),ess_6sittalk,Epworth Sleepiness Scale: Chance of dozing while sitting and talking to someone,Item from the Epworth Sleepiness Scale [Johns MW 1991 (PubMed ID: 1798888)](https://www.ncbi.nlm.nih.gov/pubmed/1798888)
[Search for all ESS variables within this dataset](https://sleepdata.org/datasets/abc/variables?search=epworth),choices,"",epworth,ess,"","",""
Questionnaires/Epworth Sleepiness Scale (ESS),ess_7afterlunch,Epworth Sleepiness Scale: Chance of dozing while sitting quietly after lunch without alcohol,Item from the Epworth Sleepiness Scale [Johns MW 1991 (PubMed ID: 1798888)](https://www.ncbi.nlm.nih.gov/pubmed/1798888)
[Search for all ESS variables within this dataset](https://sleepdata.org/datasets/abc/variables?search=epworth),choices,"",epworth,ess,"","",""
Questionnaires/Epworth Sleepiness Scale (ESS),ess_8stoppedcar,"Epworth Sleepiness Scale: Chance of dozing while in a car, while stopped for a few minutes in traffic",Item from the Epworth Sleepiness Scale [Johns MW 1991 (PubMed ID: 1798888)](https://www.ncbi.nlm.nih.gov/pubmed/1798888)
[Search for all ESS variables within this dataset](https://sleepdata.org/datasets/abc/variables?search=epworth),choices,"",epworth,ess,"","",""
Questionnaires/Epworth Sleepiness Scale (ESS),ess_total,Epworth Sleepiness Scale: Total score,Calculated - Total score based on an 8-item questionnaires ranking likelihood of dozing off [Johns MW 1991 (PubMed ID: 1798888)](https://www.ncbi.nlm.nih.gov/pubmed/1798888). Scale 0-3 for individual items; 0 to 24 for overall score.
[Search for all ESS variables within this dataset](https://sleepdata.org/datasets/abc/variables?search=epworth),integer,"","",ess,ess_1sitread + ess_2watchingtv + ess_3sitinactive + ess_4passenger + ess_5lyingdown + ess_6sittalk + ess_7afterlunch + ess_8stoppedcar,true,""