Reset Password

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.

Warning Notice

This is a U.S. Government computer system, which may be accessed and used only for authorized Government business by authorized personnel. Unauthorized access or use of this computer system may subject violators to criminal, civil, and/or administrative action. All information on this computer system may be intercepted, recorded, read, copied, and disclosed by and to authorized personnel for official purposes, including criminal investigations. Such information includes sensitive data encrypted to comply with confidentiality and privacy requirements. Access or use of this computer system by any person, whether authorized or unauthorized, constitutes consent to these terms. There is no right of privacy in this system.

You have logged in with a temporary password. Please update your password. Passwords must contain 8 or more characters and must contain at least 3 of the following types of characters:

Subscribe to our mailing list

Mailing List(s)
Email Format

You are now leaving the National Database for Autism Research (NDAR) web site to go to:

Click on the address above if the page does not change within 10 seconds.


NDAR is not responsible for the content of this external site and does not monitor other web sites for accuracy.

Accept Terms
Selected Filters
No filters selected

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
No filters have been selected
Switch User

EEG Subject



Basic information about a study subject related to an EEG/EGG experiment including demographics, pedigree, and diagnosis/phenotype

Download Definition as
Download Submission Template as
Element NameData TypeSizeRequiredDescriptionValue RangeNotes
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*
src_subject_idString20RequiredSubject ID how it's defined in lab/project
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.
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYYRequired field
genderString20RequiredSex of the subjectM;FM = Male; F = Female
age_in_yearsFloatRecommendedAge in Years
height_metFloatRecommendedHeight - Metric Unit
weight_metFloatRecommendedWeight - Metric Unit
head_circumFloatRecommendedHead Circumference (in cm)-1 = Not known
tsmfemaleIntegerRecommendedTSM Female development stage1::5; 9; 9998; 99991 = Prepubertal. No breast tissue; 2 = Areolar enlargement with breast bud; 3 = Enlargement of breast and areola as single mound; 4 = Projection of areola above breast as double mound; 5 = Adult. Papilla projects out of areola that is part of breast contour; 9 = Missing value; 9998 =subject skipped; 9999=not applicable--subject is not female
tsmmaleIntegerRecommendedTSM Male development stage1::5; 9; 9998; 99991 = Prepubertal; 2 = Testes enlarge. Scrotum larger, reddened and coarser; 3 = Penis enlarges, initially in length. Continued growth of testes and scrotum; 4 = Penis grows in length and breadth. Continued growth of testes and scrotum; 5 = Testes, scrotum and penis adult size; -9 = Missing value; 9998 =subject skipped; 9999=not applicable--subject is not male
tsmbothIntegerRecommendedTSM Pubic hair development stage1::6; 9; 99981 = None; 2 = Few darker hairs along labia or at base of penis; 3 = Curly pigmented hairs across pubes; 4 = Small adult configuration; 5 = Adult configuration with spread onto inner thighs; 6 = Adult configuration with spread to linea alba; -9 = Missing value; 9998=subject skipped
tanneravgFloatRecommendedaverage of Tanner_PH and Tanner_BG
sleep_btString50RecommendedChild's bedtime
risetimeString25Recommendedself reported weekday rise time
tibminFloatRecommendedtime in bed in minutes calculated from Bedtime and Risetime
bt_fracFloatRecommendedself reported weekday bedtime converted to fraction of 24 hour day. (Note if after midnight the fraction is greater than 1)
rt_fracFloatRecommendedtime in bed as fraction of 24 hour day
epworthFloatRecommendedEpworth sleepiness score
cdi_totalFloatRecommendedchild depression inventory total score999 =NA/Missing
cdi_aFloatRecommendedcomponents of the CDI score
cdi_bIntegerRecommendedcomponents of the CDI score
cdi_cIntegerRecommendedcomponents of the CDI score
cdi_dIntegerRecommendedcomponents of the CDI score
cdi_eIntegerRecommendedcomponents of the CDI score
current_medicationString200Recommendedsubject's current medications
siteString100RecommendedSiteStudy Site
weekFloatRecommendedWeek in level/study99=week 10-week 14
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_subject01 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.