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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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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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Continuous Performance Test



Download Definition as
Download Submission Template as
Element NameData TypeSizeRequiredDescriptionValue RangeNotesAliases
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*nimhid
src_subject_idString20RequiredSubject ID how it's defined in lab/projectid, ptid
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYYRequired fieldsessiondate
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.age, testagey
genderString20RequiredSex of the subjectM;FM = Male; F = Femalesexmf
days_baselineIntegerRecommendedDays since baselinedaycpth, dayneuro
assbdicString5RecommendedAssessment PointD;14;E;24;LB;36;72;96;120; 9; B; 3; 7; 144; 168;192; CD=MTA baseline assessment; 14=MTA 14 month assessment; E=MTA early termination assessment; B = MTA Pre-Baseline Screening Assessment (579/579); 09 = MTA 9 Month Assessment (530/530); 24=MTA 24 month assessment; LB=LNCG baseline assessment; 36=MTA and LNCG 3 year assessment; 72=MTA and LNCG 6 year assessment; 96=MTA and LNCG 8 year assessment; 03 = MTA 3 Month Assessment (438/687);120=MTA and LNCG 10 year assessment; 7= 7th Grade Assessment (221/276); 144 = MTA & LNCG 12 Month Assessment (578/578); 168 = MTA & LNCG 14 Month Assessment (585/585); 192 = MTA & LNCG 16 Month Assessment (505/505); C = MTA Pre-Baseline Screening Assessment (78/78)asscpth, assneuro
relationshipIntegerRecommendedRelationship of respondent to individual
1::88; 90;-999
1 = Biological mom; 2 = Biological dad; 3 = Grandparent; 4 = Special education (sped) teacher; 5 = General education teacher; 6 = Occupational therapist; 7 = Speech and language therapist; 8 = Behavioral therapist; 9 = Paraprofessional; 10 = Aide; 11 = Principal; 12 = Administrator; 13 = Other; 14 = Content teacher; 15 = Parent center director; 16 = Self; 17=Adoptive mother; 18=Adoptive father; 19=Foster mother; 20 = Foster father; 21=Grandmother; 22=Grandfather; 23=Step-mother; 24 = Step-father; 25=Aunt; 26=Uncle; 27=Missing Data; 28=Both parents;31= Grandmother from mother side; 32= Grandfather from mother side; 33= Grandmother from father side; 34= Grandfather from father side; 36= Brother; 37= Sister; 38= Cousin; 39= female caregiver; 40=male caregiver; 41=Female child; 42=Male child; 43=Spouse/Mate; 44=Friend; 45=Parent; 46=Significant other; 47=Sibling; 48=Son/Daughter; 49=Son-in-law/Daughter-in law; 50=Other Relative; 51=Paid caregiver; 52=Friends; 53=Roommate; 54=Supervisor; 55=mother's boyfriend; 56=other parental figure; 57=Summary; 58=counselor ; 59 = other female relative; 60 = other male relative; 61 = non-relative ; 62=Maternal Aunt; 63=Maternal Uncle; 64=Maternal Cousin; 65 = Paternal Aunt; 66=Paternal Uncle; 67=Paternal Cousin ; 68=Biological/Adoptive Mother and Grandmother; 69=Biological/Adoptive Mother and Stepmother and Grandmother; 70=Biological/Adoptive Mother and Grandmother and Foster Father; 71=Biological/Adoptive Mother and Stepmother and Foster Mother; 72=Biological/Adoptive Mother and Foster Mother; 73=Biological/Adoptive Mother and Biological/Adoptive Father; 74=Biological/Adoptive Mother and Stepmother and Biological/Adoptive Father; 75=Biological/Adoptive Mother and Other; 76=Biological/Adoptive Mother and Stepmother and Stepfather; 77=Biological/Adoptive Mother and Stepfather; 78=Biological/Adoptive Mother and Grandfather; 79=Biological/Adoptive Mother and Stepmother and Foster Father; 80=Biological/Adoptive Mother and Stepmother; 81=Guardian, female; 82=Other female; 83=Guardian, male; 84=Other male; 85=Other/Grandparent/Nanny; 86 = Mother, Father, Guardian; 87 = Daughter, son, grandchild; 88 = Professional (e.g., social worker, nurse, therapist, psychiatrist, or group home staff); 90=Other; -999=Missingrelcpth, relneuro
actbdicIntegerRecommendedActive status0::50=Inactive-Data collected after the 14 month treatment phase/after early termination from treatment phase/prior to treatment phase; 1=Active-Data collected during the 14 month treatment phase while subject received originally assigned treatment regardless of degree of compliance; 2=Active-This is the last active assessment for subjects who were about to violate treatment arm by receiving alternate treatment; 3=Active-This is the last active assessment for subjects who were about to leave the study by moving away;4=Yes, Active; 5=No, Not Activeactcpth, actneuro
siteString100RecommendedSiteStudy Sitesitenum
sjtypIntegerRecommendedSubject type1;21=MTA randomized trial subject; 2=Local normative comparison group (LNCG) subject
cpthtimeString20RecommendedTime testedHH:MM:SS
cpththFloatRecommendedTotal hits
cpthtfaFloatRecommendedTotal false alarms
cpthtmFloatRecommendedTotal misses
cpthtlcFloatRecommendedTotal late corrects
cpthtrmFloatRecommendedTotal Reaction Time Score (mean score) (in milliseconds)
cpthtrsdFloatRecommendedTotal Reaction Time Score (standard deviation) (in milliseconds)
cpthtinFloatRecommendedTotal Inattention Score
cpthtimFloatRecommendedTotal Impulsivity Score
cpthtdyFloatRecommendedTotal Dyscontrol Score
cpthe1hFloatRecommendedEpoch 1 Hits
cpthe2hFloatRecommendedEpoch 2 Hits
cpthe3hFloatRecommendedEpoch 3 Hits
cpthe4hFloatRecommendedEpoch 4 Hits
cpthe1faFloatRecommendedEpoch 1 False Alarms
cpthe2faFloatRecommendedEpoch 2 False Alarms
cpthe3faFloatRecommendedEpoch 3 False Alarms
cpthe4faFloatRecommendedEpoch 4 False Alarms
cpthe1rmFloatRecommendedEpoch 1 Reaction Time Score (mean score) (in milliseconds)
cpthe2rmFloatRecommendedEpoch 2 Reaction Time Score (mean score) (in milliseconds)
cpthe3rmFloatRecommendedEpoch 3 Reaction Time Score (mean score) (in milliseconds)
cpthe4rmFloatRecommendedEpoch 4 Reaction Time Score (mean score) (in milliseconds)
cpthe1rdFloatRecommendedEpoch 1 Reaction Time Score (standard deviation) (in milliseconds)
cpthe2rdFloatRecommendedEpoch 2 Reaction Time Score (standard deviation) (in milliseconds)
cpthe3rdFloatRecommendedEpoch 3 Reaction Time Score (standard deviation) (in milliseconds)
cpthe4rdFloatRecommendedEpoch 4 Reaction Time Score (standard deviation) (in milliseconds)
rtmeanFloatRecommendedMean Reaction Timestimdisplay1rt
rtsdFloatRecommendedWhole test - standard deviation of mean hit reaction time
rtvarFloatRecommendedReaction Time Variance
rtcvFloatRecommendedReaction Time Coefficient of Variation
omissFloatRecommendedNumber of errors of omission
omisspctFloatRecommendedPercentage of errors of omission
comissFloatRecommendedNumber of errors of commission
comispctFloatRecommendedPercentage of errors of commission
muFloatRecommendedEx-Gaussian statistic MU
sigmaFloatRecommendedEx-Gaussian statistic SIGMA
tauFloatRecommendedEx-Gaussian statistic TAU
np_cpt_test1_2dig_hitsIntegerRecommendedTest 1 (2-digit) Hits0::30
np_cpt_test1_2dig_faIntegerRecommendedTest 1 (2-digit) False Alarms0::30
np_cpt_test1_2dig_ranIntegerRecommendedTest 1 (2-digit) Randoms0::90
np_cpt_test1_2dig_dFloatRecommendedTest 1 (2-digit) d-prime, discriminability
np_cpt_test2_3dig_hitsIntegerRecommendedTest 2 (3-digit) Hits0::30
np_cpt_test2_3dig_faIntegerRecommendedTest 2 (3-digit) False Alarms0::30
np_cpt_test2_3dig_ranIntegerRecommendedTest 2 (3-digit) Randoms0::90
np_cpt_test2_3dig_dFloatRecommendedTest 2 (3-digit) d-prime, discriminability
np_cpt_test3_4dig_hitsIntegerRecommendedTest 3 (4-digit) Hits0::30
np_cpt_test3_4dig_faIntegerRecommendedTest 3 (4-digit) False Alarms0::30
np_cpt_test3_4dig_ranIntegerRecommendedTest 3 (4-digit) Randoms0::90
np_cpt_test3_4dig_dFloatRecommendedTest 3 (4-digit) d-prime, discriminability
nc_omisIntegerRecommendedCPT number of Ommissions Score
nc_commIntegerRecommendedCPT number of Commissions Score
nc_dpFloatRecommendedCPT d Prime Score
rand_numIntegerRecommendedRandomization Number0::2
daysrzIntegerRecommendeddays since randomization
weekFloatRecommendedWeek in level/study99=week 10-week 14
subject_responseString10RecommendedSubject's responsestimdisplay1resp
proceduretrialString20Recommendedtrial typeprocedureblock
stimulus_typeString50RecommendedStimulus set (e.g. "tones")stimulustrial
hitFloatRecommendedTrue Positivecpt_hits
falsealarmFloatRecommendedFalse Alarmcpt_fa
delaytrialIntegerRecommendedtime in milliseconds between end of previous stimulus and beginning of current stimulus.
cpt_mn_hFloatRecommendedMean Response Time correct go
cpt_md_hFloatRecommendedMedian Response Time correct go
cpt_sd_hFloatRecommendedStandard Deviation Response Time correct go
cpt_inh_cnt_750FloatRecommendedNumber of correct inhibited for delay=750
cpt_mn_h_750FloatRecommendedMean Response Time inhibition false alarms for when delay=750
cpt_md_h_750FloatRecommendedMedian Response Time inhib False when delay=750
cpt_sd_h_750FloatRecommendedStandard Deviation Response Time inhibition false alarms delay=750
cpt_inh_cnt_1750FloatRecommendedNumber of correct inhibited for delay=1750
cpt_mn_h_1750FloatRecommendedMean Response Time inhibition false alarms for when delay=1750
cpt_md_h_1750FloatRecommendedMedian Response Time inhib False when delay=1750
cpt_sd_h_1750FloatRecommendedStandard Deviation Response Time inhibition false alarms delay=1750
cpt_inh_cnt_3750FloatRecommendedNumber of correct inhibited for delay=3750
cpt_mn_h_3750FloatRecommendedMean Response Time inhibition false alarms for when delay=3750
cpt_md_h_3750FloatRecommendedMedian Response Time inhib False when delay=3750
cpt_sd_h_3750FloatRecommendedStandard Deviation Response Time inhibition false alarms delay=3750
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: cpth01 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.