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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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Alternative Medications and Therapies



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/projectaid
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
siteString100RecommendedSiteStudy SiteASITE
clinicidIntegerRecommendedClinic IDACLINIC
intervIntegerRecommendedIntervention Status0;11=ITV, intervention; 0=TAU, treatment as usual
visitString50RecommendedVisit nameCharacter description of each type of visitWAVE
days_baselineIntegerRecommendedDays since baselineLOF
arx1IntegerRecommendedIn the past 6 months, have you taken any nonprescription medications or herbal remedies to help with your mood or energy? This includes preparations such as Kava Kava, or St. Johns Wort.0;10=No; 1=Yes
arx2aIntegerRecommendedTaking Chamomile to help you with your mood or energy?0;10=No; 1=Yes
arx2bIntegerRecommendedTaking Kava to help you with your mood or energy?0;10=No; 1=Yes
arx2cIntegerRecommendedTaking Lavender to help you with your mood or energy?0;10=No; 1=Yes
arx2dIntegerRecommendedTaking St. John's Wort to help you with your mood or energy?0;10=No; 1=Yes
arx2eIntegerRecommendedTaking Valerian to help you with your mood or energy?0;10=No; 1=Yes
arx2fIntegerRecommendedTaking Chasteberry to help you with your mood or energy?0;10=No; 1=Yes
arx2gIntegerRecommendedTaking Black Cohosh to help you with your mood or energy?0;10=No; 1=Yes
arx2hIntegerRecommendedTaking Other (Specify) to help you with your mood or energy?0;10=No; 1=Yes
arx3IntegerRecommendedIn the past 6 months have you used any therapies or healing practices (such as acupuncture, biofeedback, going to a chiropractor, prayer or spiritual practices) for problems with your mood or energy?0;10=No; 1=Yes
arx4aIntegerRecommendedUsed Acupuncture0;10=No; 1=Yes
arx4bIntegerRecommendedUsed Biofeedback0;10=No; 1=Yes
arx4cIntegerRecommendedUsed Chiropractic0;10=No; 1=Yes
arx4dIntegerRecommendedUsed Energy Healing0;10=No; 1=Yes
arx4eIntegerRecommendedUsed Exercise or Movement or Therapy0;10=No; 1=Yes
arx4fIntegerRecommendedUsed Homeopathy0;10=No; 1=Yes
arx4gIntegerRecommendedUsed Hypnosis0;10=No; 1=Yes
arx4hIntegerRecommendedUsed Imagery Techniques0;10=No; 1=Yes
arx4iIntegerRecommendedUsed Massage Therapy0;10=No; 1=Yes
arx4jIntegerRecommendedUsed Prayer or Other Spiritual Practices0;10=No; 1=Yes
arx4kIntegerRecommendedUsed Relaxation or Meditation Techniques0;10=No; 1=Yes
specialdiet_pastString6Recommendedtaking special diets in the past?TRUE;FALSE; NKARX4L
arx4mIntegerRecommendedUsed Spiritual Healing by Others0;10=No; 1=Yes
arx4nIntegerRecommendedUsed Any Other Non-Traditional Remedy or Therapy0;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: arx01 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.