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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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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

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Data Structures with shared data
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EEG Form



Download Definition as
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Element NameData TypeSizeRequiredDescriptionValue RangeNotesAliases
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*guid
src_subject_idString20RequiredSubject ID how it's defined in lab/projectsubject_id
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging was completed. MM/DD/YYYYRequired fieldintvdate
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.intvage
genderString20RequiredSex of the subjectM;FM = Male; F = Female
siteString100RecommendedSiteStudy Site
visitString50RecommendedVisit nameCharacter description of each type of visit
eeg00aString10RecommendedParadigm order of this test: (enter A or B in the box)
eeg00bIntegerRecommendedWas EEG performed pre- or post-medication administration? (question in baseline visit only)1;2;-91=Pre-med; 2=Post-med;-9 = Unknown
eeg001IntegerRecommendedWas an EEG performed on this subject?0;10=No; 1=Yes
eeg003aIntegerRecommendedHandedness: Which do you prefer to use when both hands are available? Draw?1::51=Left only;2=Left Usually;3=Both;4=Right Usually;5=Right only
eeg003bIntegerRecommendedHandedness: Which do you prefer to use when both hands are available? Throw a ball?1::51=Left only;2=Left Usually;3=Both;4=Right Usually;5=Right only
eeg003cIntegerRecommendedHandedness: Which do you prefer to use when both hands are available? Butter toast?1::51=Left only;2=Left Usually;3=Both;4=Right Usually;5=Right only
eeg003dIntegerRecommendedHandedness: Which do you prefer to use when both hands are available? Brush your teeth?1::51=Left only;2=Left Usually;3=Both;4=Right Usually;5=Right only
eeg003eIntegerRecommendedHandedness: Which do you prefer to use when both hands are available? Cut with scissors?1::51=Left only;2=Left Usually;3=Both;4=Right Usually;5=Right only
eeg003fIntegerRecommendedHandedness: Which do you prefer to use when both hands are available? Hold a spoon?1::51=Left only;2=Left Usually;3=Both;4=Right Usually;5=Right only
eeg003gIntegerRecommendedHandedness: Which do you prefer to use when both hands are available? Write?1::51=Left only;2=Left Usually;3=Both;4=Right Usually;5=Right only
eeg004IntegerRecommendedDid you regularly do activities that require you to use your non-preferred hand a lot? (i.e. a sport or a handicraft)0;10=No; 1=Yeseeg_1
eeg004aString250RecommendedIf "Yes", description:
eeg005IntegerRecommendedHave you ever had fractures of the hand or other problems that seriously affected the use of your hands?0;10=No; 1=Yeseeg_2
eeg005aString250RecommendedIf "Yes", description:eeg_2a
eeg006IntegerRecommendedNormal, uncorrected vision?0;10=No; 1=Yes
eeg006aIntegerRecommendedCorrected vision? (i.e., glasses, contacts, laser surgery)0;10=No; 1=Yes
eeg006bIntegerRecommendedDo you see well when you are wearing your glasses/contact or since the surgery?0;10=No; 1=Yeseeg_4a
eeg007IntegerRecommendedNormal hearing?0;10=No; 1=Yeseeg_3
eeg008aString20RecommendedPrevious night sleep duration: Sleep start time: (hh:mm, 24-hour clock; enter 55:55 if unknown)eeg_5a
eeg008bString20RecommendedPrevious night sleep duration: Sleep end time: (hh:mm, 24-hour clock; enter 55:55 if unknown)eeg_5b
eeg008cFloatRecommendedPrevious night sleep duration: Number of hours0::24
eeg009IntegerRecommendedSubjective rest: How rested do you feel?1::51=Rested; 5=Tiredeeg_6
eeg010IntegerRecommendedWas any medication taken within the last 24 hours? (Include over-the-counter medications)0;10=No; 1=Yeseeg_7
eeg011IntegerRecommendedCaffeine: Have you consumed any caffeine today?0;10=No; 1=Yeseeg_8
eeg011aString20RecommendedEEG. What time? (hh:mm0, 24-hour clock; enter 55:55 if unknown)eeg_8a
eeg011bIntegerRecommendedWhat type?1::51=Coffee;2=Tea;3=Energy drink;4=Soda;5=Other (specify below)eeg_8b
eeg011cString50RecommendedIf Other, specifyeeg_8b_other
eeg011dIntegerRecommendedQuantity1::31=Low (0-1 drinks, based on 8 oz cup of coffee);2=Moderate (2-3 drinks);3=High (4+ drinks)
eeg012IntegerRecommendedWomen only: Still experiencing menstrual periods?0;1;90=No; 1=Yes; 9=N/A
eeg012aDateRecommendedIf "Yes", date of the first day of most recent menstrual period: (mm/dd/yyyy)
eeg013String20RecommendedEEG Start time: (hh:mm, 24-hour clock)eegadmin_1
head_circumFloatRecommendedHead Circumference (in cm)-1 = Not knowneeg014, eegadmin_5
eeg015String50RecommendedCap Size: (PM, PL, AS, AM, AL, AXL)eegadmin_4
eeg016IntegerRecommendedCap Type1;21=EGI; 2=Neuroscan
eeg016aString10RecommendedCap ID Number: (serial number)
eeg016bIntegerRecommendedCap Fit Quality1::31=Poor (RE-NET);2=Good;3=Excellenteegadmin_6
eeg017IntegerRecommendedNumber of attempts to final start net
eeg018IntegerRecommendedImpedances measured0;10=No; 1=Yeseegadmin_7
electrode_impedanceIntegerRecommendedelectrode impedance in kOhmeeg019
eeg020IntegerRecommendedBad Electrodes0;10=No; 1=Yeseegadmin_9
eeg020aString30RecommendedIf yes, which Electrodes (number, position)eegadmin_9a
eeg021FloatRecommendedDistance of participant from monitor (cm)
eeg022String20RecommendedEEG End time: (hh:mm, 24-hour clock)eegadmin_1a
eeg023IntegerRecommendedRoom set up1;21=Standard; 2=Deviations
eeg023aString250RecommendedRoom set up: Please explain the deviation
eeg024IntegerRecommendedPolhemus set up1;21=Standard; 2=Deviations
eeg024aString250RecommendedPolhemus set up: Please explain the deviation
eeg025IntegerRecommendedExperiment order1;21=Standard; 2=Deviations
eeg025aString250RecommendedExperiment order: Please explain the deviation
eeg026IntegerRecommendedFaces0;10=No; 1=Yes
eeg026aIntegerRecommendedFaces: If "Yes", data quality1::31=Good;2=Questionable (Describe in note);3=Invalid (Describe in note)
eeg026bIntegerRecommendedFaces: If "Yes", response hand1;21=Right; 2=Left
eeg026cString250RecommendedFaces: Note
eeg027IntegerRecommendedCompleted. Eyes Closed. Resting state0;10=No; 1=Yeseegec_done
eeg027aIntegerRecommendedEyes Closed: If "Yes", data quality. Resting state1::31=Good;2=Questionable (Describe in note);3=Invalid (Describe in note)eegec_qual
eeg027cString250RecommendedEyes Closed: Note
eeg028IntegerRecommendedCognitive Flanker0;10=No; 1=Yes
eeg028aIntegerRecommendedCognitive Flanker: If "Yes", data quality1::31=Good;2=Questionable (Describe in note);3=Invalid (Describe in note)
eeg028bIntegerRecommendedCognitive Flanker: If "Yes", response hand1;21=Right; 2=Left
eeg028cString250RecommendedCognitive Flanker: Note
eeg029IntegerRecommendedCompleted. Eyes Open. Resting state0;10=No; 1=Yeseegeo_done
eeg029aIntegerRecommendedEyes Open: If "Yes", data quality. Resting state1::31=Good;2=Questionable (Describe in note);3=Invalid (Describe in note)eegeo_qual
eeg029cString250RecommendedEyes Open: Note
eeg030IntegerRecommendedSensory Processing0::31=Yes, both;2=Yes, SOR only;3=Yes, Auditory Tones only;0=No (Specify in note)
eeg030aIntegerRecommendedSensory Processing: SOR data quality1::31=Good;2=Questionable (Describe in note);3=Invalid (Describe in note)
eeg030dIntegerRecommendedSensory Processing: SOR response hand1;21=Right; 2=Left
eeg030bIntegerRecommendedSensory Processing: Auditory Tones data quality1::31=Good;2=Questionable (Describe in note);3=Invalid (Describe in note)
eeg030cString250RecommendedSensory Processing: Note
eeg031IntegerRecommendedSubjective rest: How tired do you feel?1::51=Energetic; 5=Exhaustedeeg_9
eeg032IntegerRecommendedSubjective mood: What is your mood like?1::51=Happy; 5=Sadeeg_10
eeg033IntegerRecommendedSubjective task success: How well do you think you did overall?1::51=Great; 5=Terribleeeg_11
phne_sc_40String100RecommendedHealth/Medical. If yes (are you currently taking any medications), which ones and dosageeeg_7a
eegadmin_2String10RecommendedStart time of capping
eegadmin_2aString10RecommendedEnd time of capping
eegadmin_3String10RecommendedStart time of digitizer
eegadmin_3aString10RecommendedEnd time of digitizer
eegadmin_8IntegerRecommendedThreshold used:
eegdfr_doneIntegerRecommendedDFR Completed?0;10=No; 1=Yes
eegdfr_startString10RecommendedDFR: start time
eegdfr_endString10RecommendedDFR_end time
eegdfr_qualIntegerRecommendedDFR: data quality1::31=Good;2=Questionable; 3=Invalid
eegdfr_qual2IntegerRecommendedDFR: reason1::51=Movement; 2=Attention; 3=Talking; 4=Excessive Blinking; 5=Other
eegdfr_qual2_otherString200RecommendedDFR: If Other, please specify
eegeo_startString10RecommendedEyes Open: start time (resting state)
eegeo_endString10RecommendedEyes Open: end time (resting state)
eegeo_qual2IntegerRecommendedEyes Open: Reason (resting state)1::51=Movement; 2=Attention; 3=Talking; 4=Excessive Blinking; 5=Other
eegeo_qual2_otherString200RecommendedEyes Open: If other, please specify (resting state)
eegdpx_doneIntegerRecommendedDPX: Completed?0;10=No; 1=Yes
eegdpx_startString10RecommendedDPX: start time
eegdpx_endString10RecommendedDPX: end time
eegdpx_qualIntegerRecommendedDPX: Data quality1::31=Good;2=Questionable; 3=Invalid
eegdpx_qual2IntegerRecommendedDPX: Reason1::51=Movement; 2=Attention; 3=Talking; 4=Excessive Blinking; 5=Other
eegdpx_qual2_otherString200RecommendedDPX: if other, please specify
eegec_startString10RecommendedEyes Closed: start time (resting state)
eegec_endString10RecommendedEyes Closed: end time (resting state)
eegec_qual2IntegerRecommendedEyes Closed: Reason (resting state)1::51=Movement; 2=Attention; 3=Talking; 4=Excessive Blinking; 5=Other
eegec_qual2_otherString200RecommendedEyes Closed: if other, please specify (resting state)
eegcda_doneIntegerRecommendedCDA: Completed?0;10=No; 1=Yes
eegcda_startString10RecommendedCDA: start time
eegcda_endString10RecommendedCDA: end time
eegcda_qualIntegerRecommendedCDA: Data quality1::31=Good;2=Questionable; 3=Invalid
eegcda_qual2IntegerRecommendedCDA: Reason1::51=Movement; 2=Attention; 3=Talking; 4=Excessive Blinking; 5=Other
eegcda_qual2_otherString200RecommendedCDA: if other, please specify
eegscap_doneIntegerRecommendedSCAP: Completed?0;10=No; 1=Yes
eegscap_startString10RecommendedSCAP: start time
eegscap_endString10RecommendedSCAP: end time
eegscap_qualIntegerRecommendedSCAP: Data quality1::31=Good;2=Questionable; 3=Invalid
eegscap_qual2IntegerRecommendedSCAP: Reason1::51=Movement; 2=Attention; 3=Talking; 4=Excessive Blinking; 5=Other
eegscap_qual2_otherString200RecommendedSCAP: if other, please specify
eeg_4IntegerRecommendedVision: Do you have normal or corrected to normal vision (glasses/contacts/laser surgery)?0;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: eeg_details01 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.