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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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Lethality Scale



Download Definition as
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Element NameData TypeSizeRequiredDescriptionValue RangeNotesAliases
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*
src_subject_idString20RequiredSubject ID how it's defined in lab/project
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging was completed. MM/DD/YYYYRequired fielddate_leth
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.
genderString20RequiredSex of the subjectM;FM = Male; F = Female
i01drugsIntegerRecommendedLethality Scale for Drugs with Sedative Effects0::80 = Fully conscious and alert; 1 = Conscious but sleepy; 2 = Lethargic with diminution in intellectual ability; 3 = Asleep but easily aroused;4 = Comatose--withdrawal from painful stimuli; reflexes intact; injury sufficient for hospitalization; 5 = Comatose--no withdrawal from painful stimuli, most reflexes intact; no respiratory or circulatory depression; injury sufficient for ICU monitoring; 6 = Comatose--most reflexes absent; no respiratory or circulatory depression; ICU and significant medical procedure (e.g., dialysis); 7 = Comatose--all reflexes absent; respiratory depression; 8 = Death
i01metIntegerRecommendedLethality Scale for Drugs with Sedative Effects Method Code1::101 = Antipsychotic; 2 = Antidepressant; 3 = BDZ/HYP; 4 = Recreational; 5 = Alcohol; 6 = Gas/Asphyxia; 7 = Non-Psychotropic Prescription; 8 = OTC Sedative; 9 = Unknown; 10 = Anticonvulsants
i02drugsIntegerRecommendedLethality Scale for Drugs without Sedative Effects and for other Ingested Substances (e.g. household ammonia)0::80 = No or minimal medical consequences or treatment; 2 = Some injury (e.g. mouth burns) and treatment in emergency room or on outpatient basis (e.g. gastric lavage); 4 = Injury sufficient for hospitalization--vital signs and level of consciousness may be affected level of consciousness may be affected; 6 = Major systemic effects--such as G.I. perforation, renal failure, blood hemolysis, or shock; vital signs unstable; 8 = Death
i02metIntegerRecommendedLethality Scale for Drugs without Sedative Effects Method code1::81 = Non Psychotropic Prescription; 2 = Over-the-Counter Drugs; 3 = Other Ingested Substances; 4 = Recreational; 5 = Lithium; 6 = Anticholinergic; 7 = Starvation; 8 = Unknown
i03shootIntegerRecommendedLethality Scale for Shooting0::80 = No damage; 2 = Flesh wounds with powder burns; 3 = Bullet lodged in extremity - minor bleeding; 5 = Bullet in abdomen or chest - major bleeding; vital signs unstable; 7 = Bullet to head area; 8 = Death
i04immolIntegerRecommendedLethality Scale for Immolation0::80 = No damage; 2 = First degree burns; 3 = Second degree burns; 5 = Third degree burns under 20% body area; 7 = Third degree burns over 60% body area; 8 = Death
i05drownIntegerRecommendedLethality Scale for Drowning0::80 = No damage; 2 = Conscious--some respiratory distress but no resuscitation needed; 3 = Conscious--minimal to moderate efforts at resuscitation needed; 5 = Conscious--extensive efforts at resuscitation needed; 7 = Unconscious--massive efforts at resuscitation necessary for revival; 8 = Death
i06cutIntegerRecommendedLethality Scale for Cutting0::80 = Surface scratches; none or minor bleeding; little or no wound care required; 2 = Moderate bleeding with clotting before significant blood loss occurs: simple wound care required; 3 = Bleeding of major veins, danger of considerable blood loss without surgical intervention--suturing necessary but no transfusion; vital areas intact and no change in vital signs; care on outpatient basis; 5 = Extensive blood loss; suturing, blood replacement and tendon repair required; wound may be to head, thorax, or abdomen but vital organs intact and vital signs stable; recovery with inpatient care expected; 7 = Extensive blood loss with shock; insult to vital areas with change in vital signs; recovery with inpatient care doubtful; 8 = Death
i07jumpIntegerRecommendedLethality Scale for Jumping0::80 = Minor bruises only - no treatment necessary; 2 = Sprains or minor injuries - no bone, ligament, or tendon damage; no internal bleeding, tissue or brain damage; 3 = Extremities fractured - casting necessary but no major tendon repair and complete recovery expected; 5 = Major bone and/or tendon damage in multiple areas - internal bleeding; some residual impairment expected but not in vital areas; 7 = Major damage to vital area (skull, neck, spinal column) - paralysis expected; 8 = Death
i08hangIntegerRecommendedLethality Scale for Hanging0::80 = No damage; 2 = Simple rope burns; 3 = More extensive injuries with treatment on outpatient basis; 5 = Hospitalization and resuscitation required ;7 = Paralysis or other spinal cord injury; 8 = Death
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: letsca01 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.