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NDAR provides a single access to de-identified autism research data. For permission to download data, you will need an NDAR account with approved access to NDAR or a connected repository (AGRE, IAN, or the ATP). For NDAR access, you need to be a research investigator sponsored by an NIH recognized institution with federal wide assurance. See Request Access for more information.

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Selected Filters
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The filters you have selected from various query interfaces will be stored here, in the 'Filter Cart'. The database will be queried using filters added to your 'Filter Cart', when multiple filters are defined, each will be executed using 'AND' logic, so with each filter that is applied the result set gets smaller.

From the 'Filter Cart' you can inspect each of the filters that have been defined, and you also have the option to remove filters. The 'Filter Cart' itself will display the number of filters applied along with the number of subjects that are identified by the combination of those filters. For example a GUID filter with two subjects, followed by a GUID filter for just one of those subjects would return only data for the subject that is in both GUID filters.

If you have a question about the filter cart, or underlying filters please contact the help desk at The NDA Help Desk

Value Range
Data Structures with shared data
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OAI Imaging Inventory



Download Definition as
Download Submission Template as
Element NameData TypeSizeRequiredDescriptionValue RangeNotesAliases
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*
src_subject_idString20RequiredSubject ID how it's defined in lab/project
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging was completed. MM/DD/YYYYRequired field
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
raceString30RecommendedRace of study subjectAmerican Indian/Alaska Native; Asian; Hawaiian or Pacific Islander; Black or African American; White; More than one race; Unknown or not reported
ethnicityString30RecommendedEthnicity of participantHispanic or Latino; Not Hispanic or Latino; Unknown
versionString20RecommendedVersion/code of assessment
e_cohortIntegerRecommendedSubcohort assignment1::31: Progression; 2: Incidence; 3: Non-exposed control group
visitString50RecommendedVisit nameCharacter description of each type of visit
visit_nameString20Recommendedsession ID/screening ID
radx_visitString10Recommended1st visit RA reported w/meds
xrklrString10RecommendedKL Grade Rightp=prosthetic; t=technical problems
oagrdrIntegerRecommendedKL grade equivalent Right0::50=Normal; 1=Possible; 2=Definite, mild; 3=Moderate; 4=Severe; 5=Prosthetic
rksxIntegerRecommendedknee symptom status Right0::20=No pain in past 12 months; 1= pain in past 12 months, not most days of month; 2=Pain most day of month in past 12 months
indexkneerIntegerRecommendedOAI Index Knee Right0;10=No; 1=Yes
inc03_rIntegerRecommendedIn Prj 03 Right0;10=No; 1=Yes
inc04_rIntegerRecommendedIn Prj 04 Right0;10=No; 1=Yes
inc07_rIntegerRecommendedIn Prj 07 Right0;10=No; 1=Yes
inc08_rIntegerRecommendedIn Prj 08Right0;10=No; 1=Yes
inc09_rIntegerRecommendedIn Prj 09 Right0;10=No; 1=Yes
inc10_rIntegerRecommendedIn Prj 10 Right0;10=No; 1=Yes
inc15_rIntegerRecommendedIn Prj 15 Right0;10=No; 1=Yes
inc16_rIntegerRecommendedIn Prj 16 Right0;10=No; 1=Yes
inc17_rIntegerRecommendedIn Prj 17 Right0;10=No; 1=Yes
inc18_rIntegerRecommendedIn Prj 18 Right0;10=No; 1=Yes
inc22_rIntegerRecommendedIn Prj 22 Right0;10=No; 1=Yes
inc37_rIntegerRecommendedIn Prj 37 Right0;10=No; 1=Yes
inc39_rIntegerRecommendedIn Prj 39 Right0;10=No; 1=Yes
inc40_rIntegerRecommendedIn Prj 40 Right0;10=No; 1=Yes
inc60_rIntegerRecommendedIn Prj 60 Right0;10=No; 1=Yes
xrkllString10RecommendedKL Grade Leftp=prosthetic; t=technical problems
oagrdlIntegerRecommendedKL grade equivalent Left0::50=Normal; 1=Possible; 2=Definite, mild; 3=Moderate; 4=Severe; 5=Prosthetic
lksxIntegerRecommendedknee symptom status Left0::20=No pain in past 12 months; 1= pain in past 12 months, not most days of month; 2=Pain most day of month in past 12 months
indexkneelIntegerRecommendedOAI Index Knee Left0;10=No; 1=Yes
inc03_lIntegerRecommendedIn Prj 03 Left0;10=No; 1=Yes
inc04_lIntegerRecommendedIn Prj 04 Left0;10=No; 1=Yes
inc07_lIntegerRecommendedIn Prj 07 Left0;10=No; 1=Yes
inc08_lIntegerRecommendedIn Prj 08 Left0;10=No; 1=Yes
inc09_lIntegerRecommendedIn Prj 09 Left0;10=No; 1=Yes
inc10_lIntegerRecommendedIn Prj 10 Left0;10=No; 1=Yes
inc15_lIntegerRecommendedIn Prj 15 Left0;10=No; 1=Yes
inc16_lIntegerRecommendedIn Prj 16 Left0;10=No; 1=Yes
inc17_lIntegerRecommendedIn Prj 17 Left0;10=No; 1=Yes
inc18_lIntegerRecommendedIn Prj 18 Left0;10=No; 1=Yes
inc22_lIntegerRecommendedIn Prj 22 Left0;10=No; 1=Yes
inc37_lIntegerRecommendedIn Prj 37 Left0;10=No; 1=Yes
inc39_lIntegerRecommendedIn Prj 39 Left0;10=No; 1=Yes
inc40_lIntegerRecommendedIn Prj 40 Left0;10=No; 1=Yes
inc60_lIntegerRecommendedIn Prj 60 Left0;10=No; 1=Yes
mri_corerIntegerRecommendedMRI: Have Core Sequences Right0;10=No; 1=Yes
mri_coriwrIntegerRecommendedMRI: Have COR IW Right0;10=No; 1=Yes
mri_sagdsrIntegerRecommendedMRI: Have SAG DESS Right0;10=No; 1=Yes
mri_sagiwrIntegerRecommendedMRI: Have SAG IW Right0;10=No; 1=Yes
mri_axmprrIntegerRecommendedMRI: Have AX MPR Right0;10=No; 1=Yes
mri_cormprrIntegerRecommendedMRI: Have COR MPR Right0;10=No; 1=Yes
mri_t2maprIntegerRecommendedMRI: Have SAG T2 MAP Right0;10=No; 1=Yes
mri_corflashrIntegerRecommendedMRI: Have COR T1 FLASH Right0;10=No; 1=Yes
mri_corelIntegerRecommendedMRI: Have Core Sequences Left0;10=No; 1=Yes
mri_coriwlIntegerRecommendedMRI: Have COR IW Left0;10=No; 1=Yes
mri_sagdslIntegerRecommendedMRI: Have SAG DESS Left0;10=No; 1=Yes
mri_sagiwlIntegerRecommendedMRI: Have SAG IW Left0;10=No; 1=Yes
mri_axmprlIntegerRecommendedMRI: Have AX MPR Left0;10=No; 1=Yes
mri_cormprlIntegerRecommendedMRI: Have COR MPR Left0;10=No; 1=Yes
mri_t2maplIntegerRecommendedMRI: Have SAG T2 MAP Left0;10=No; 1=Yes
mri_corflashlIntegerRecommendedMRI: Have COR T1 FLASH Left0;10=No; 1=Yes
mri_thighIntegerRecommendedMRI: Have Thigh0;10=No; 1=Yes
oai_xrayIntegerRecommendedHave bilat fixed flexion xray0;10=No; 1=Yesxray
fulllimbIntegerRecommendedHave full limb xray0;10=No; 1=Yes
pelvisIntegerRecommendedHave pelvis xray0;10=No; 1=Yes
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)
  • For valid elements with shared data, on the far left is a Filter button you can use to view a summary of shared data for that element and apply a query filter to your Cart based on selected value ranges

At the top of this page you can also:

  • Use the search bar to filter the elements displayed. This will not filter on the Size of Required columns
  • Download a copy of this definition in CSV format
  • Download a blank CSV submission template prepopulated with the correct structure header rows ready to fill with subject records and upload

Please email the The NDA Help Desk with any questions.

Distribution for DataStructure: oaiimage01 and Element:
Chart Help

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.