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Frequently Asked Questions


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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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Clinical Assessments
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Query Element Name Data Type Size Required Description Value Range Notes Aliases
subjectkey GUID Required The NDAR Global Unique Identifier (GUID) for research subject NDAR*
src_subject_id String 20 Required Subject ID how it's defined in lab/project subject_1
interview_date Date Required Date on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYY Required field
interview_age Integer Required Age in months at the time of the interview/test/sampling/imaging. 0 :: 1260 Age 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.
sex String 20 Required Sex of the subject M;F M = Male; F = Female gender
Query subtrial_1 Integer Recommended Subtrial number
Query a1avg_1 Float Recommended Sum of AB1avg and BA1avg /2
Query ab_1 Integer Recommended Feedback condition for ab1/ba1 image trials
Query ab1avg_1 Integer Recommended Percentage of AB1 trials correct
Query abavg_1 Integer Recommended Percentage of AB trials correct
Query alltrials200_1 Integer Recommended Trial number
Query ba1avg_1 Integer Recommended Percentage of BA1 trials correct
Query baavg_1 Integer Recommended Percentage of BA trials correct
Query blankscreen_offsettime_1 Integer Recommended Offset time of blank screen
Query blankscreen_onsetdelay_1 Integer Recommended Onset delay of blank screen
Query blankscreen_onsettime_1 Integer Recommended Onset time of blank screen
Query blankscreen_onsetooonsettime_1 Integer Recommended Onset time interval of blank screen
Query c1avg_1 Float Recommended Sum of CD1avg and DC1avg /2
Query cd_1 Integer Recommended Feedback condition for cd1/dc1 image trials
Query cd1avg_1 Integer Recommended Percentage of CD1 trials correct
Query cdavg_1 Integer Recommended Percentage of CD trials correct
Query correctresponse_1 Integer Recommended Correct response for trial
Query dc1avg_1 Integer Recommended Percentage of DC1 trials correct
Query dcavg_1 Integer Recommended Percentage of DC trials correct
fb_1 String 1 Recommended Feedback image
Query feedbackslide_offsettime_1 Integer Recommended Offset time of feedback slide
Query feedbackslide_onsetdelay_1 Integer Recommended Onset delay of feedback slide
Query feedbackslide_onsettime_1 Integer Recommended Onset time of feedback slide
Query feedbackslide_onsettoonsettime Integer Recommended Onset time interval of feedback slide
Query filler_offsettime_1 Integer Recommended Offset time of filler slide
Query filler_onsetdelay_1 Integer Recommended Onset delay of filler slide
Query filler_onsettime_1 Integer Recommended Onset time of filler slide
Query filler_onsettoonsettime_1 Integer Recommended Onset time interval of filler slide
Query jitter_1 Integer Recommended Trial jitter
Query miss_1 Integer Recommended Missed trials
picture1_1 String 3 Recommended Trial picture
Query pictureslide_duration_1 Integer Recommended Trial stimulus duration
Query pictureslide_offsettime_1 Integer Recommended Offset time of trial stimulus
Query pictureslideonsetdelay_1 Integer Recommended Onset delay of trial stimulus
Query pictureslide_onsettime_1 Integer Recommended Onset time of trial stimulus
Query pictureslide_onsettoonsettime Integer Recommended Onset time interval of trial stimulus
Query pictureslide_resp_1 Integer Recommended Subject response
Query pictureslide_rt_1 Integer Recommended Subject response time per trial
Query pictureslide_rttime_1 Integer Recommended Subject response time, running timer
Query textdisplay1_offsettime_1 Integer Recommended Offset time of text slide
Query textdisplay1_onsetdelay_1 Integer Recommended Onset delay of text slide
Query textdisplay1_onsettime_1 Integer Recommended Onset time of text slide
Query textdisplay1_onsettoonsettime Integer Recommended Onset time interval of text slide
data_file1 File Recommended Data file 1
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.