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Frequently Asked Questions


NDA Help Center

Filter Cart

The Filter Cart provides a powerful way to query and access data for which you may be interested.  

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 run a query, it may take a moment to populate but this will happen in the background so you can define other queries 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 structures or collections 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 shown.  To see other data structures, select "Find All Subject Data" which will query all data for those subjects. When a secord or third filter is applied, an AND condition is used.  A subject must exist in all filters.  If the subject does not appear in any one filter, that subjects data will not be included in your filter cart. If that happens, clear your filter cart, and start over.  

It is best to package more data than you need and access those data using other tools, independent of the NDA (e.g. miNDAR snapshot), to limit the data selected.  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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NDA provides a single access to de-identified autism research data. For permission to download data, you will need an NDA account with approved access to NDA or a connected repository (AGRE, IAN, or the ATP). For NDA 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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Additional Subject Information



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 fielddate_additional_info
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.
sexString20RequiredSex of the subjectM;FM = Male; F = Femalegender
med2aIntegerRecommendedVisit Number (most recently attended visit)0::250=Baselinevisit_number_scan_day_info
lastmealIntegerRecommendedHow many hours ago did you last eat?1::41= 0-3; 2= 4-8; 3= 9-12; 4= 13 or morelast_meal
alcohol_yes_or_noIntegerRecommendedHave you consumed any alcohol in the last 7 days?0;10= No; 1= Yes
last_alcoholIntegerRecommendedIf yes, how many days ago did you last drink?1::51= 1-2; 2= 3-4; 3= 5-7; 4= 7 or more; 5= N/A
number_of_drinksIntegerRecommendedIf yes, how many alcoholic drinks did you have?1::41= 1-3; 2= 4-8; 3= 9 or more; 4= N/A
hours_of_sleepIntegerRecommendedHow many total hours of sleep did you get last night?0::30= 0; 1= 1-4; 2= 5-8; 3= 9 or more
why_no_sleepString50RecommendedIf no sleep, explain why:
pls1_y_nic_useIntegerRecommendedHave you used nicotine (such as cigarettes, electronic cigarettes/vape pen/e-hookah, hookah, chewing tobacco, or cigar) in the last 24 hours?0 ; 11 = Yes; 0 = Nosmoked_cigarettes
number_of_cigarettesIntegerRecommendedIf yes, how many cigarettes have you had in the last 24 hours?1::51= 1-2; 2= 3-4; 3= 5-7; 4= 8 or more; 5= N/A
hours_ago_smokedIntegerRecommendedHow many hours ago did you last smoke?0::51= 0-3; 2= 4-8; 3= 9-12; 4= 13 or more; 5= N/A
caffeine_last_24_hoursIntegerRecommendedHave you had any caffeine in the last 24 hours?0;10= No; 1= Yes
caffeine_hours_agoIntegerRecommendedIf yes, how many hours ago did you consume caffeine?1::51= 0-3; 2= 4-8; 3= 9-12; 4= 13 or more; 5= N/A
servings_of_caffeineIntegerRecommendedHow many servings of caffeine did you have?1::41= 1-2; 2= 3-4; 3= 5 or more; 4= N/A
sub_medsIntegerRecommendedHave you taken any medication in the last 24 hours besides the study drug?0;10= No; 1= Yesmedications
name_of_medicationsString50RecommendedIf you have taken medications in the last 24 hours, please list:
hours_ago_medication_takenIntegerRecommendedHow many hours ago did you take any of the medications listed?1::51= 0-3; 2= 4-8; 3= 9-12; 4= 13 or more; 5= N/A
interventions_treatmentsIntegerRecommendedHave you received any medical intervention or treatment since your last scan visit (e.g., psychiatric appointments, psychotherapy, emergency room visits, regular doctors visits, etc.)?1::61= Psych appointments; 2= Psychotherapy; 3= Emergency room visits; 4= Regular doctor visits; 5= Other; 6= Noneinterventions_treatments__1, interventions_treatments__2, interventions_treatments__3, interventions_treatments__4, interventions_treatments__5, interventions_treatments__6
notes_interven_treatString255RecommendedIf the response to above question is any of the following Psych appointments, Psychotherapy, Emergency room visits. regular doctor visits, other, please explain in detail.
exerciseIntegerRecommendedDid you engage in any physical activity or exercise for at least 20 mins in the last 24 hrs?0; 10=No; 1=Yes
exercise_hours_agoIntegerRecommendedDid you engage in any physical activity or exercise for at least 20 mins in the last 24 hrs? If yes, how many hours ago?1::51= 0-3; 2= 4-8; 3= 9-12; 4= 13 or more; 5= N/A
exercise_durationIntegerRecommendedHow long did you exercise?1::51= 30; 2= 60; 3= 90; 4= more than 90; 5= N/A
menstruating_currentlyIntegerRecommendedIf female, are you currently menstruating?1::31= Yes; 2= No; 3= N/A= Male
start_of_menstrual_cycleIntegerRecommendedIf yes, how many days ago did your menstrual cycle begin?1::41= 0-2; 2= 3-4; 3= 5-7; 4= 8 or more
date_menst_psychhxString30RecommendedFirst date of the last menstrual cycle (females only)first_day_lmp
duration_of_lmpIntegerRecommendedLength of menstrual cycle, days1::41= 1-2; 2= 3-4; 3= 5-7; 4= 8 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)
  • 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: sub_info01 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.