NDA Help Center

Frequently Asked Questions


NDA Help Center

Filter Cart

The Filter Cart provides a way to query and access data for which you may be interested.  There are multiple places to go query and Add to Filter Cart (Sometimes called Download).  

A few points related to the filter cart are important to understand with the NDA Query/Filter implementation: 

First, the filter cart is populated asyncronously.  So, when you add subjects, sometimes it may take a few minutes to populate.  You can continue to do other things during this time. 

When you are adding your first filter, all data associated with your query will be added to the filter cart (whether it be a collection, a concept, a study, a data structure/elment or subjects). Not all data available for the subjects selected will necessarily be displayed.  For example, if you select the NDA imaging structure image03, and further restrict that query to scan_type fMRI, only fMRI images will appear and only the image03 structure will be available.  However, if you want to see all of the clinical and phenotype, then select, "Find All Subject Data" to see all the data avaialble for those subjects.  

when a secord or third filter is applied, an AND condition is used to determine the subjects that are exist in all filters.  If the subject does not appear in any filter, that subjects data will be excluded from your filter cart. Given the sparcity of data in the NDA, it is possible for no subjects to appear across filters.  If that happens, clear your filter cart, and start over.  

The NDA is looking to enhance query/filtering.  Until additional tools become available, it is best to package more data than you need and then package and download the data and use other tools to further restrict and analyze the data.  If you have any questions on data access, are interested in using avaialble web services or need help accessing data, please contact us for assistance.  

Frequently Asked Questions



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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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This is a U.S. Government computer system, which may be accessed and used only for authorized Government business by authorized personnel. Unauthorized access or use of this computer system may subject violators to criminal, civil, and/or administrative action. All information on this computer system may be intercepted, recorded, read, copied, and disclosed by and to authorized personnel for official purposes, including criminal investigations. Such information includes sensitive data encrypted to comply with confidentiality and privacy requirements. Access or use of this computer system by any person, whether authorized or unauthorized, constitutes consent to these terms. There is no right of privacy in this system.

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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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Digit Symbol Substitution Test



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/biospecimen was completed. MM/DD/YYYYRequired fieldstudyday, v2_dsst_date
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.v10_dsst_age, v2_dsst_age, v4_dsst_age
genderString20RequiredSex of the subjectM;FM = Male; F = Female
cpthtimeString20RecommendedTime testedHH:MM:SS
d2_tnIntegerRecommendedTotal number of symbols processed, rawdigit, v10_dsst_total_symbols, v2_dsst_total_symbols, v4_dsst_total_symbols
dsst_errorsIntegerRecommendedNumber of errorsv10_dsst_errors, v2_dsst_errors, v4_dsst_errors
version_formString100RecommendedForm used/assessment namedigitsymbol_version
ncaidIntegerRecommendedPrimary ID of Neurocognitive Test
siteString100RecommendedSiteStudy Sitesiteid
timeptIntegerRecommendedTime Point888 = not applicable; 999 = missingtimepoint
testreasonString255RecommendedReason for Testingdigitsymbol_type
digitsymbol_symbolIntegerRecommendedNumber of the Symbol Shown (1-9)
digitsymbol_digitIntegerRecommendedWhich Digit Press for Correct Response (1-3)
digitsymbol_responseIntegerRecommendedDigit Responded With (1-3)
responsecorrectIntegerRecommendedResponse Correct (1=Correct)0 :: 10=Incorrect; 1=Correctdigitsymbol_correct
rtFloatRecommendedReaction Timedigitsymbol_rt
crt_stateString9RecommendedResponded via Keyb/Touch/Mousekeyup=Keyboard; mouseup=Mouse (mouseup); pointerup=Mouse (pointerup); timeout=Timed Out; touchend=Touchscreendigitsymbol_state
battery_idIntegerRecommendedIdentifier of Batterydigitsymbol_batteryid
testidIntegerRecommendedIdentifier of Current Testdigitsymbol_testid
session_idString20Recommendedsession ID/screening IDdigitsymbol_sittingid
cbgroupIntegerRecommendedCounterbalancing Groupdigitsymbol_group
aurora_deviceIntegerRecommendedDevice Used1 :: 61=iPad; 2=iPhone; 3=Tablet; 4=Android Smartphone; 5=Desktop; 6=Laptopdigitsymbol_device
visitString50RecommendedVisit nameCharacter description of each type of visitdigitsymbol_timepoint
digitsymbol_num_correctIntegerRecommendedNumber Of Correct Matches In 90 Seconds
digitsymbol_num_responsesIntegerRecommendedNumber Of Total Responses In 90 Seconds
digitsymbol_meanrtcFloatRecommendedMean Reaction Time For All Correct Trials (ms)
digitsymbol_medianrtcFloatRecommendedMedian Reaction Time For All Correct Trials (ms)
digitsymbol_sdrtcFloatRecommendedStandard Deviation Of Reaction Times Across All Correct Trials (ms)
deviceserialnumberString200Recommendeddevice serial number/IDdigitsymbol_useragent
testdurationIntegerRecommendedSeconds Taken To Complete Testdigitsymbol_duration
testrestartsIntegerRecommendedNumber Of Times Participant Restarted Testdigitsymbol_reloaded
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: dsst01 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.