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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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Data Structures with shared data
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Letter Comparison Test

47 Shared Subjects

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
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 lct1 Integer Recommended YCX __YMX 1;2 1=Same; 2=Different
Query lct2 Integer Recommended HTRBDP __HTRBDP 1;2 1=Same; 2=Different
Query lct3 Integer Recommended LNDPRSKQB __LNDPRSJQB 1;2 1=Same; 2=Different
Query lct4 Integer Recommended HCF __RCF 1;2 1=Same; 2=Different
Query lct5 Integer Recommended QTPRJX __QTPNJX 1;2 1=Same; 2=Different
Query lct6 Integer Recommended MZDYGVGKQ __MZDYGLBKQ 1;2 1=Same; 2=Different
Query lct7 Integer Recommended FQTNMK __JQTNMK 1;2 1=Same; 2=Different
Query lct8 Integer Recommended CLJ __CLJ 1;2 1=Same; 2=Different
Query lct9 Integer Recommended JGDMNSVPW __JGZMNSVPW 1;2 1=Same; 2=Different
Query lct10 Integer Recommended FPTVHKCBJ __FPTVHKCBJ 1;2 1=Same; 2=Different
Query lct11 Integer Recommended XRPZBS __ZRPZBH 1;2 1=Same; 2=Different
Query lct12 Integer Recommended ZSQ __ZSP 1;2 1=Same; 2=Different
Query lct13 Integer Recommended MPZRXL __MPZRXL 1;2 1=Same; 2=Different
Query lct14 Integer Recommended KJH __KRH 1;2 1=Same; 2=Different
Query lct15 Integer Recommended SMNHVTFCB __SMNHVTFCB 1;2 1=Same; 2=Different
Query lct16 Integer Recommended KJWTQF __KJWTQF 1;2 1=Same; 2=Different
Query lct17 Integer Recommended CHDKQGLMB __CHDKQGLMB 1;2 1=Same; 2=Different
Query lct18 Integer Recommended GHQ __GHQ 1;2 1=Same; 2=Different
Query lct19 Integer Recommended GFVMRH __GFVMRH 1;2 1=Same; 2=Different
Query lct20 Integer Recommended RSM __RSM 1;2 1=Same; 2=Different
Query lct21 Integer Recommended BSRJTRMLG __BSFJTRMLG 1;2 1=Same; 2=Different
Query lct22 Integer Recommended NBGFSM __NBGFSM 1;2 1=Same; 2=Different
Query lct23 Integer Recommended JQKBPLXGY __JQKBPLXGY 1;2 1=Same; 2=Different
Query lct24 Integer Recommended RNV __FNV 1;2 1=Same; 2=Different
Query lct25 Integer Recommended PRDBZTYFN __PRDBZTYFN 1;2 1=Same; 2=Different
Query lct26 Integer Recommended NCWJDZ __NCMJDZ 1;2 1=Same; 2=Different
Query lct27 Integer Recommended KHW __KBW 1;2 1=Same; 2=Different
Query lct28 Integer Recommended ZRBGMF __ZRBCMF 1;2 1=Same; 2=Different
Query lct29 Integer Recommended BTH __BYH 1;2 1=Same; 2=Different
Query lct30 Integer Recommended XWKQRYCNZ __XWKQRYCNZ 1;2 1=Same; 2=Different
Query lct31 Integer Recommended HNPDLK __HNPDLK 1;2 1=Same; 2=Different
Query lct32 Integer Recommended WMQTRSGLZ __WMQTRZGLZ 1;2 1=Same; 2=Different
Query lct33 Integer Recommended JPN __JPN 1;2 1=Same; 2=Different
Query lct34 Integer Recommended QLXSVT __QLNSVT 1;2 1=Same; 2=Different
Query lct35 Integer Recommended YXHKZVFPB __YXHKZVFPD 1;2 1=Same; 2=Different
Query lct36 Integer Recommended RJZ __RJZ 1;2 1=Same; 2=Different
Query lct37 Integer Recommended CLNPZD __CLNPZD 1;2 1=Same; 2=Different
Query lct38 Integer Recommended DCBPFHXYJ __DCBPFHXYJ 1;2 1=Same; 2=Different
Query lct39 Integer Recommended MWR __ZWR 1;2 1=Same; 2=Different
Query lct40 Integer Recommended LPKXZW __LPKXZW 1;2 1=Same; 2=Different
Query lct41 Integer Recommended TZL __TZQ 1;2 1=Same; 2=Different
Query lct42 Integer Recommended CSDBFPHXZ __CSDBFPHXZ 1;2 1=Same; 2=Different
Query lct43 Integer Recommended QHZXPC __QHZWPC 1;2 1=Same; 2=Different
Query lct44 Integer Recommended GZN __GZN 1;2 1=Same; 2=Different
Query lct45 Integer Recommended JNWXHPFBD __JNWXHPFMD 1;2 1=Same; 2=Different
Query lct46 Integer Recommended Total number of correct items
Query evt_total Integer Recommended Total Number of incorrect items
Query lct48 Integer Recommended Letter Comparison Test score _lettersum
Query letter_total_pg1 Integer Recommended Letter total pg1 letter1, letterscorepg1
Query letter_total_pg2 Integer Recommended Letter total pg2 letter2, letterscorepg2
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.