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Osteoartritis X-Ray Outcome Form

outcome

01

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Element NameData TypeSizeRequiredDescriptionValue RangeNotesAliases
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*
src_subject_idString20RequiredSubject ID how it's defined in lab/projectid
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging was completed. MM/DD/YYYYRequired fieldvddcf
interview_ageIntegerRequiredAge in months at the time of the interview/test/sampling/imaging.0 :: 1260Age is rounded to chronological month. If the research participant is 15-days-old at time of interview, the appropriate value would be 0 months. If the participant is 16-days-old, the value would be 1 month.
genderString20RequiredSex of the subjectM;FM = Male; F = Female
visitString50RecommendedVisit nameCharacter description of each type of visit
rkdateDateRecommendedright knee, date of follow-up knee replacement
rkfldtIntegerRecommendedright knee, date flag, date of follow-up knee replacement from self report or adjudicated from medical records0;10= Self-report; 1= Medical records
lkdateDateRecommendedleft knee, date of follow-up knee replacement
lkfldtIntegerRecommendedleft knee, date flag, date of follow-up knee replacement from self report or adjudicated from medical records0;10= Self-report; 1= Medical records
rkrpcfIntegerRecommendedright knee, follow-up knee replacement adjudication/confirmation status0::30= Replacement adjudcated,failed to conf; 1= Self-reported replacement ; 2= Replacement pending adjudication; 3= Replacement adjudicated, confirmed
lkrpcfIntegerRecommendedleft knee, follow-up knee replacement adjudication/confirmation status0::30= Replacement adjudcated,failed to conf; 1= Self-reported replacement ; 2= Replacement pending adjudication; 3= Replacement adjudicated, confirmed
rktlprIntegerRecommendedright knee, total or partial follow-up knee replacement1;21= Total; 2= Partial
lktlprIntegerRecommendedleft knee, total or partial follow-up knee replacement1;21= Total; 2= Partial
rktpprIntegerRecommendedright knee, type of partial follow-up knee replacement1::41= Partial lateral; 2= Partial medial; 3= Partial patello-femoral; 4= Unable to determine
lktpprIntegerRecommendedleft knee, type of partial follow-up knee replacement1::41= Partial lateral; 2= Partial medial; 3= Partial patello-femoral; 4= Unable to determine
rkblrpIntegerRecommendedright knee, knee replacement seen on baseline OAI x-ray0::20= No; 1= Yes; 2= Not sure
lkblrpIntegerRecommendedleft knee, knee replacement seen on baseline OAI x-ray0::20= No; 1= Yes; 2= Not sure
rkvsrpIntegerRecommendedright knee, OAI visit follow-up knee replacement self-reported at0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lkvsrpIntegerRecommendedleft knee, OAI visit follow-up knee replacement self-reported at0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rkpodxIntegerRecommendedright knee, primary pre-operative diagnosis1::81= Osteoarthritis or degenerative arthris; 2= Rheumatoid arthritis; 3= Acute fracture or acute trauma; 4= Post-traumatic arthritis (old trauma); 5= Osteonecrosis; 6= Revision/salvage of previous replacem; 7= Unable to determine from doc provided; 8= Other
lkpodxIntegerRecommendedleft knee, primary pre-operative diagnosis1::81= Osteoarthritis or degenerative arthris; 2= Rheumatoid arthritis; 3= Acute fracture or acute trauma; 4= Post-traumatic arthritis (old trauma); 5= Osteonecrosis; 6= Revision/salvage of previous replacem; 7= Unable to determine from doc provided; 8= Other
rkdaysIntegerRecommendedright knee, days between enrollment visit and follow-up knee replacement
lkdaysIntegerRecommendedleft knee, days between enrollment visit and follow-up knee replacement
rkvsprIntegerRecommendedright knee, closest OAI visit prior to follow-up knee replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rkvsafIntegerRecommendedright knee, closest OAI visit after follow-up knee replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lkvsprIntegerRecommendedleft knee, closest OAI visit prior to follow-up knee replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lkvsafIntegerRecommendedleft knee, closest OAI visit after follow-up knee replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rkrpsnIntegerRecommendedright knee, knee replacement seen on follow-up OAI x-ray0::20= No replacement seen on any FU xray 1= Yes, replacement seen on FU xray 2= No FU xrays of this knee (or hip)
lkrpsnIntegerRecommendedleft knee, knee replacement seen on follow-up OAI x-ray0::20= No replacement seen on any FU xray 1= Yes, replacement seen on FU xray 2= No FU xrays of this knee (or hip)
rkxrprIntegerRecommendedright knee, closest OAI visit with knee x-ray prior to follow-up knee replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rkxrafIntegerRecommendedright knee, closest OAI visit with knee x-ray after follow-up knee replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lkxrprIntegerRecommendedleft knee, closest OAI visit with knee x-ray prior to follow-up knee replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lkxrafIntegerRecommendedleft knee, closest OAI visit with knee x-ray after follow-up knee replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rhdateDateRecommendedright hip, date of follow-up hip replacement
rhfldtIntegerRecommendedright hip, date flag, date of follow-up hip replacement from self report or adjudicated from medical records0;10= Self-report; 1= Medical records
lhdateDateRecommendedleft hip, date of follow-up hip replacement
lhfldtIntegerRecommendedleft hip, date flag, date of follow-up hip replacement from self report or adjudicated from medical records0;10= Self-report 1= Medical records
rhrpcfIntegerRecommendedright hip, follow-up hip replacement adjudication/confirmation0::30= Replacement adjudcated,failed to conf; 1= Self-reported replacement ; 2= Replacement pending adjudication; 3= Replacement adjudicated, confirmed
lhrpcfIntegerRecommendedleft hip, follow-up hip replacement adjudication/confirmation status0::30= Replacement adjudcated,failed to conf; 1= Self-reported replacement ; 2= Replacement pending adjudication; 3= Replacement adjudicated, confirmed
rhpodxIntegerRecommendedright hip, primary pre-operative diagnosis1::81= Osteoarthritis or degenerative arthris; 2= Rheumatoid arthritis; 3= Acute fracture or acute trauma; 4= Post-traumatic arthritis (old trauma); 5= Osteonecrosis; 6= Revision/salvage of previous replacem; 7= Unable to determine from doc provided; 8= Other
lhpodxIntegerRecommendedleft hip, primary pre-operative diagnosis1::81= Osteoarthritis or degenerative arthris; 2= Rheumatoid arthritis; 3= Acute fracture or acute trauma; 4= Post-traumatic arthritis (old trauma); 5= Osteonecrosis; 6= Revision/salvage of previous replacem; 7= Unable to determine from doc provided; 8= Other
rhdaysIntegerRecommendedright hip, days between enrollment visit and follow-up hip replacement
lhdaysIntegerRecommendedleft hip, days between enrollment visit and follow-up hip replacement
rhvsprIntegerRecommendedright hip, closest OAI visit prior to follow-up hip replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rhvsafIntegerRecommendedright hip, closest OAI visit after follow-up hip replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lhvsprIntegerRecommendedleft hip, closest OAI visit prior to follow-up hip replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lhvsafIntegerRecommendedleft hip, closest OAI visit after follow-up hip replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rhrpsnIntegerRecommendedright hip, hip replacement seen on follow-up OAI x-ray0::20= No replacement seen on any FU xray; 1= Yes, replacement seen on FU xray; 2= No FU xrays of this knee (or hip)
lhrpsnIntegerRecommendedleft hip, hip replacement seen on follow-up OAI x-ray0::20= No replacement seen on any FU xray; 1= Yes, replacement seen on FU xray; 2= No FU xrays of this knee (or hip)
rhxrprIntegerRecommendedright hip, closest OAI visit with hip x-ray prior to follow-up hip replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rhxrafIntegerRecommendedright hip, closest OAI visit with hip x-ray after follow-up hip replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lhxrprIntegerRecommendedleft hip, closest OAI visit with hip x-ray prior to follow-up hip replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lhxrafIntegerRecommendedleft hip, closest OAI visit with hip x-ray after follow-up hip replacement0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rhvsrpIntegerRecommendedright hip, OAI visit follow-up hip replacement self-reported at0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lhvsrpIntegerRecommendedleft hip, OAI visit follow-up hip replacement self-reported at0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rhblrpIntegerRecommendedright hip, hip replacement seen on baseline OAI x-ray0::20= No; 1= Yes; 2= Not sure
lhblrpIntegerRecommendedleft hip, hip replacement seen on baseline OAI x-ray0::20= No; 1= Yes; 2= Not sure
ddcfIntegerRecommendeddeath adjudication/confirmation status0::20= Death reported,no documentation avail; 1= Death pending adjudication; 2= Death adjudicated, confirmed
dthdateDateRecommendedDate of deathdddate
ddfldtIntegerRecommendeddate flag, date of death from documentation or from reported date of death0;10= Reported death; 1= Confirmed date from documentation
ddvsprIntegerRecommendedclosest OAI visit prior to death0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rxioaIntegerRecommendedright knee, summary incident TF ROA KL >= 20::80= No follow-up knee x-rays or KL data; 1= KL>=2 at BL; 2= KL0-1 at BL, follow-up x-rays but no; 3= KL0-1 at BL, incident KL2 at 12 mo; 4= KL0-1 at BL, incident KL2 at 24 mo; 5= KL0-1 at BL, incident KL2 at 36 mo; 6= KL0-1 at BL, incident KL2 at 48 mo; 7= KL0-1 at BL, incident KL2 at 72 mo; 8= KL0-1 at BL, incident KL2 at 96 mo
rxioanIntegerRecommendedright knee, summary incident TF ROA KL >= 2 with JSN0::80= No follow-up knee x-rays or KL data; 1= KL>=2 with JSN at BL; 2= KL0-1 with JSN at BL, FU xrays but no; 3= KL0-1 or KL2 with no JSN at BL, incid; 4= KL0-1 or KL2 with no JSN at BL, incid; 5= KL0-1 or KL2 with no JSN at BL, incid; 6= KL0-1 or KL2 with no JSN at BL, incid; 7= KL0-1 or KL2 with no JSN at BL, incid; 8= KL0-1 or KL2 with no JSN at BL, incid
rxnoaIntegerRecommendedright knee, last visit KL < 20::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rxnoanIntegerRecommendedright knee, last visit KL < 2 or KL=2 with no JSN0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lxioaIntegerRecommendedleft knee, summary incident TF ROA KL >= 20::80= No follow-up knee x-rays or KL data; 1= KL>=2 at BL; 2= KL0-1 at BL, follow-up x-rays but no; 3= KL0-1 at BL, incident KL2 at 12 mo; 4= KL0-1 at BL, incident KL2 at 24 mo; 5= KL0-1 at BL, incident KL2 at 36 mo; 6= KL0-1 at BL, incident KL2 at 48 mo; 7= KL0-1 at BL, incident KL2 at 72 mo; 8= KL0-1 at BL, incident KL2 at 96 mo
lxioanIntegerRecommendedleft knee, summary incident TF ROA KL >= 2 with JSN0::80= No follow-up knee x-rays or KL data; 1= KL>=2 with JSN at BL; 2= KL0-1 with JSN at BL, FU xrays but no; 3= KL0-1 or KL2 with no JSN at BL, incid; 4= KL0-1 or KL2 with no JSN at BL, incid; 5= KL0-1 or KL2 with no JSN at BL, incid; 6= KL0-1 or KL2 with no JSN at BL, incid; 7= KL0-1 or KL2 with no JSN at BL, incid; 8= KL0-1 or KL2 with no JSN at BL, incid
lxnoaIntegerRecommendedleft knee, last visit KL < 20::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
lxnoanIntegerRecommendedleft knee, last visit KL < 2 or KL=2 with no JSN0::12; 660= Baseline; 1= 12-month; 2= 18-month; 3= 24-month; 4= 30-month; 5= 36-month; 6= 48-month; 7= 60-month; 8= 72-month; 9= 84-month; 10= 96-month; 11= 108-month; 12= 120-month; 66= No post-replacement follow-up x-ray
rxjsnmIntegerRecommendedright knee, summary medial JSN progression to 96 mo visit0::50= No follow-up knee x-rays or readings; 1= BL JSN=3 or BL TKR; 2= BL JSN<3, no JSN increase; 3= BL JSN<3, within grade JSN increase; 4= BL JSN<3, >= full grade JSN increase; 5= BL JSN<3, no worsening but has FU TKR
rxjsnlIntegerRecommendedright knee, summary lateral JSN progression to 96 mo visit0::50= No follow-up knee x-rays or readings; 1= BL JSN=3 or BL TKR; 2= BL JSN<3, no JSN increase; 3= BL JSN<3, within grade JSN increase; 4= BL JSN<3, >= full grade JSN increase; 5= BL JSN<3, no worsening but has FU TKR
lxjsnmIntegerRecommendedleft knee, summary medial JSN progression to 96 mo visit0::50= No follow-up knee x-rays or readings; 1= BL JSN=3 or BL TKR; 2= BL JSN<3, no JSN increase; 3= BL JSN<3, within grade JSN increase; 4= BL JSN<3, >= full grade JSN increase; 5= BL JSN<3, no worsening but has FU TKR
lxjsnlIntegerRecommendedleft knee, summary lateral JSN progression to 96 mo visit0::50= No follow-up knee x-rays or readings; 1= BL JSN=3 or BL TKR; 2= BL JSN<3, no JSN increase; 3= BL JSN<3, within grade JSN increase; 4= BL JSN<3, >= full grade JSN increase; 5= BL JSN<3, no worsening but has FU TKR
xlvsqdIntegerRecommendedlast visit with central reading follow-up knee x-ray SQ (KL or JSN) data0::60= No FU knee x-ray or SQ (KL or JSN) data; 1= Last SQ data at 12 mo visit; 2= Last SQ data at 24 mo visit; 3= Last SQ data at 36 mo visit; 4= Last SQ data at 48 mo visit; 5= Last SQ data at 72 mo visit; 6= Last SQ data at 96 mo visit
versionFloatRecommendedVersion/code of assessment
rkloaIntegerRecommendedright knee, last visit with OA (KLG>=2) (calc)0::100= Baseline; 1= 12-month;3= 24-month;5= 36-month;6= 48-month;8= 72-month; 10= 96-month
rkloanIntegerRecommendedright knee, last visit with OA (KLG>=2 and JSN>=1) (calc)0::100= Baseline; 1= 12-month;3= 24-month;5= 36-month;6= 48-month;8= 72-month; 10= 96-month
lkloaIntegerRecommendedleft knee, last visit with OA (KLG>=2) (calc)0::100= Baseline; 1= 12-month;3= 24-month;5= 36-month;6= 48-month;8= 72-month; 10= 96-month
lkloanIntegerRecommendedleft knee, last visit with OA (KLG>=2 and JSN>=1) (calc)0::100= Baseline; 1= 12-month;3= 24-month;5= 36-month;6= 48-month;8= 72-month; 10= 96-month
rntcntIntegerRecommendedMost recent OAI contact0::110= Baseline;1= 12-month;2= 18-month;3= 24-month;4= 30-month;5= 36-month;6= 48-month;7= 60-month;8= 72-month;9= 84-month;10= 96-month;11= 108-month
rjsfpIntegerRecommendedright knee, first visit with JSN progression (partial grade or more)
rjslpIntegerRecommendedright knee, last visit with JSN progression (partial grade or more)
rnjslpIntegerRecommendedright knee, last visit with no JSN progression
rjstfpIntegerRecommendedright knee, TF compartment with initial JSN progression
rjsfwIntegerRecommendedright knee, first visit with JSN progression (whole grade or more)
rjslwIntegerRecommendedright knee, last visit with JSN progression (whole grade or more)
rnjslwIntegerRecommendedright knee, last visit with no JSN progression
rjstfwIntegerRecommendedright knee, TF compartment with initial JSN progression
ljsfpIntegerRecommendedleft knee, first visit with JSN progression (partial grade or more)
ljslpIntegerRecommendedleft knee, last visit with JSN progression (partial grade or more)
lnjslpIntegerRecommendedleft knee, last visit with no JSN progression (partial grade or more)
ljstfpIntegerRecommendedleft knee, TF compartment with initial JSN progression (partial grade or more)
ljsfwIntegerRecommendedleft knee, first visit with JSN progression (whole grade or more)
ljslwIntegerRecommendedleft knee, last visit with JSN progression (whole grade or more)
lnjslwIntegerRecommendedleft knee, last visit with no JSN progression (whole grade or more)
ljstfwIntegerRecommendedleft knee, TF compartment with initial JSN progression (whole grade or more)
Data Structure

This page displays the data structure defined for the measure identified in the title and structure short name. The table below displays a list of data elements in this structure (also called variables) and the following information:

  • Element Name: This is the standard element name
  • Data Type: Which type of data this element is, e.g. String, Float, File location.
  • Size: If applicable, the character limit of this element
  • Required: This column displays whether the element is Required for valid submissions, Recommended for valid submissions, Conditional on other elements, or Optional
  • Description: A basic description
  • Value Range: Which values can appear validly in this element (case sensitive for strings)
  • Notes: Expanded description or notes on coding of values
  • Aliases: A list of currently supported Aliases (alternate element names)
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Distribution for DataStructure: outcome01 and Element:
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Filters enable researchers to view the data shared in NDA before applying for access or for selecting specific data for download or NDA Study assignment. For those with access to NDA shared data, you may select specific values to be included by selecting an individual bar chart item or by selecting a range of values (e.g. interview_age) using the "Add Range" button. Note that not all elements have appropriately distinct values like comments and subjectkey and are not available for filtering. Additionally, item level detail is not always provided by the research community as indicated by the number of null values given.

Filters for multiple data elements within a structure are supported. Selections across multiple data structures will be supported in a future version of NDA.