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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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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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ABCD Timeline Follow-back Survey Calendar Scores (TLFB)



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_dateDateRequiredDate on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYYRequired field
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
eventnameString60RequiredThe event name for which the data was collected
tlfb_cal_scr_assess_dateString30RecommendedAssessment Date
tlfb_cal_scr_num_eventsString30RecommendedNumber of recorded substance used events. Multiple usages per day for a substance are pooled together.
tlfb_cal_scr_num_bdeString30RecommendedNumber of binge drinking episodes (use per event >= 4 for female, >= 5 for male)
tlfb_cal_scr_tot_bdeString30RecommendedBinge drinking episodes total use
tlfb_cal_scr_drinksperbingeString30RecommendedBinge drinks per binge occasion
tlfb_cal_scr_alc_avgString30RecommendedAverage standard drinks on use days
tlfb_cal_scr_alc_udString30RecommendedNumber of standard drinks use days
tlfb_cal_scr_alc_tdString30RecommendedTotal dose standard drinks
tlfb_cal_scr_alc_maxString30RecommendedMax dose standard drinks
tlfb_cal_scr_alc_wuString30RecommendedNumber of standard drinks weekend use days
tlfb_cal_scr_alc_wtString30RecommendedStandard drinks weekend use total
tlfb_cal_scr_alc_ludString30RecommendedStandard drinks last use day
tlfb_cal_scr_opiaterx_avgString30RecommendedAverage pain relievers on use days
tlfb_cal_scr_opiaterx_udString30RecommendedNumber of pain relievers use days
tlfb_cal_scr_opiaterx_tdString30RecommendedTotal dose pain relievers
tlfb_cal_scr_opiaterx_maxString30RecommendedMax dose pain relievers
tlfb_cal_scr_opiaterx_wuString30RecommendedNumber of pain relievers weekend use
tlfb_cal_scr_opiaterx_wtString30RecommendedPain relievers weekend use total
tlfb_cal_scr_opiaterx_ludString30RecommendedPain relievers last use day
tlfb_cal_scr_blunt_avgString30RecommendedAverage blunts on use days
tlfb_cal_scr_blunt_udString30RecommendedNumber of blunts use days
tlfb_cal_scr_blunt_tdString30RecommendedTotal dose blunts
tlfb_cal_scr_blunt_maxString30RecommendedMax dose blunts
tlfb_cal_scr_blunt_wuString30RecommendedNumber of blunts weekend use days
tlfb_cal_scr_blunt_wtString30RecommendedBlunts weekend use total
tlfb_cal_scr_blunt_ludString30RecommendedBlunt last use day
tlfb_cal_scr_ket_avgString30RecommendedAverage Ketamine on use days
tlfb_cal_scr_ket_udString30RecommendedNumber of Ketamine use days
tlfb_cal_scr_ket_tdString30RecommendedTotal dose Ketamine
tlfb_cal_scr_ket_maxString30RecommendedMax dose Ketamine
tlfb_cal_scr_ket_wuString30RecommendedNumber of Ketamine weekend use days
tlfb_cal_scr_ket_wtString30RecommendedKetamine weekend use total
tlfb_cal_scr_ket_ludString30RecommendedKetamine last use day
tlfb_cal_scr_nicrx_avgString30RecommendedAverage nicotine replacements on use days
tlfb_cal_scr_nicrx_udString30RecommendedNumber of nicotine replacement use days
tlfb_cal_scr_nicrx_tdString30RecommendedTotal dose nicotine replacements
tlfb_cal_scr_nicrx_maxString30RecommendedMax dose nicotine replacements
tlfb_cal_scr_nicrx_wuString30RecommendedNumber of nicotine replacements weekend use days
tlfb_cal_scr_nicrx_wtString30RecommendedNicotine replacements weekend use total
tlfb_cal_scr_nicrx_ludString30RecommendedNicotine replacements last use day
tlfb_cal_scr_bthslt_avgString30RecommendedAverage cathiones on use days
tlfb_cal_scr_bthslt_udString30RecommendedNumber of cathiones use days
tlfb_cal_scr_bthslt_tdString30RecommendedTotal dose cathiones
tlfb_cal_scr_bthslt_maxString30RecommendedMax dose cathiones
tlfb_cal_scr_bthslt_wuString30RecommendedNumber of cathiones weekend use days
tlfb_cal_scr_bthslt_wtString30RecommendedCathiones weekend use total
tlfb_cal_scr_bthslt_ludString30RecommendedCathiones last use day
tlfb_cal_scr_fake_avgString30RecommendedAverage bittamugen on use days
tlfb_cal_scr_fake_udString30RecommendedNumber of bittamugen use days
tlfb_cal_scr_fake_tdString30RecommendedTotal dose bittamugen
tlfb_cal_scr_fake_maxString30RecommendedMax dose bittamugen
tlfb_cal_scr_fake_wuString30RecommendedNumber of bittamugen weekend use days
tlfb_cal_scr_fake_wtString30RecommendedBittamugen weekend use total
tlfb_cal_scr_fake_ludString30RecommendedBittamugen last use day
tlfb_cal_scr_roid_avgString30RecommendedAverage steroids on use days
tlfb_cal_scr_roid_udString30RecommendedNumber of steroids use days
tlfb_cal_scr_roid_tdString30RecommendedTotal dose steroids
tlfb_cal_scr_roid_maxString30RecommendedMax dose steroids
tlfb_cal_scr_roid_wuString30RecommendedNumber of steroids weekend use days
tlfb_cal_scr_roid_wtString30RecommendedSteroids weekend use total
tlfb_cal_scr_roid_ludString30RecommendedSteroids last use day
tlfb_cal_scr_inhal_avgString30RecommendedAverage inhalants on use days
tlfb_cal_scr_inhal_udString30RecommendedNumber of inhalants use days
tlfb_cal_scr_inhal_tdString30RecommendedTotal dose inhalants
tlfb_cal_scr_inhal_maxString30RecommendedMax dose inhalants
tlfb_cal_scr_inhal_wuString30RecommendedNumber of inhalants weekend use days
tlfb_cal_scr_inhal_wtString30RecommendedInhalants weekend use total
tlfb_cal_scr_inhal_ludString30RecommendedInhalants last use day
tlfb_cal_scr_shroom_avgString30RecommendedAverage magic mushrooms on use days
tlfb_cal_scr_shroom_udString30RecommendedNumber of magic mushrooms use days
tlfb_cal_scr_shroom_tdString30RecommendedTotal dose magic mushrooms
tlfb_cal_scr_shroom_maxString30RecommendedMax dose magic mushrooms
tlfb_cal_scr_shroom_wuString30RecommendedNumber of magic mushrooms weekend use days
tlfb_cal_scr_shroom_wtString30RecommendedMagic mushrooms weekend use total
tlfb_cal_scr_shroom_ludString30RecommendedMagic mushrooms last use day
tlfb_cal_scr_sal_avgString30RecommendedAverage saliva on use days
tlfb_cal_scr_sal_udString30RecommendedNumber of saliva use days
tlfb_cal_scr_sal_tdString30RecommendedTotal dose saliva
tlfb_cal_scr_sal_maxString30RecommendedMax dose saliva
tlfb_cal_scr_sal_wuString30RecommendedNumber of saliva weekend use days
tlfb_cal_scr_sal_wtString30RecommendedSaliva weekend use total
tlfb_cal_scr_sal_ludString30RecommendedSaliva last use day
tlfb_cal_scr_cg_avgString30RecommendedAverage cigars on use days
tlfb_cal_scr_cg_udString30RecommendedNumber of cigars use days
tlfb_cal_scr_cg_tdString30RecommendedTotal dose cigars
tlfb_cal_scr_cg_maxString30RecommendedMax dose cigars
tlfb_cal_scr_cg_wuString30RecommendedNumber of cigars weekend use days
tlfb_cal_scr_cg_wtString30RecommendedCigars weekend use total
tlfb_cal_scr_cg_ludString30RecommendedCigars last use day
tlfb_cal_scr_pipe_avgString30RecommendedAverage pipe tobacco on use days
tlfb_cal_scr_pipe_udString30RecommendedNumber of pipe tobacco use days
tlfb_cal_scr_pipe_tdString30RecommendedTotal dose pipe tobacco
tlfb_cal_scr_pipe_maxString30RecommendedMax dose pipe tobacco
tlfb_cal_scr_pipe_wuString30RecommendedNumber of pipe tobacco weekend use days
tlfb_cal_scr_pipe_wtString30RecommendedPipe tobacco weekend use total
tlfb_cal_scr_pipe_ludString30RecommendedPipe tobacco last use days
tlfb_cal_scr_dxm_avgString30RecommendedAverage cough or cold medicine on use days
tlfb_cal_scr_dxm_udString30RecommendedNumber of cough or cold medicine use days
tlfb_cal_scr_dxm_tdString30RecommendedTotal dose cough or cold medicine
tlfb_cal_scr_dxm_maxString30RecommendedMax dose cough or cold medicine
tlfb_cal_scr_dxm_wuString30RecommendedNumber of cough or cold medicine weekend use days
tlfb_cal_scr_dxm_wtString30RecommendedCough or cold medicine weekend use total
tlfb_cal_scr_dxm_ludString30RecommendedCough and cold medicine last use day
tlfb_cal_scr_coc_avgString30RecommendedAverage cocaine on use days
tlfb_cal_scr_coc_udString30RecommendedNumber of cocaine use days
tlfb_cal_scr_coc_tdString30RecommendedTotal dose cocaine
tlfb_cal_scr_coc_maxString30RecommendedMax dose cocaine
tlfb_cal_scr_coc_wuString30RecommendedNumber of cocaine weekend use days
tlfb_cal_scr_coc_wtString30RecommendedCocaine weekend use total
tlfb_cal_scr_coc_ludString30RecommendedCocaine last use day
tlfb_cal_scr_gbh_avgString30RecommendedAverage GBH on use days
tlfb_cal_scr_gbh_udString30RecommendedNumber of GBH use days
tlfb_cal_scr_gbh_tdString30RecommendedTotal dose GBH
tlfb_cal_scr_gbh_maxString30RecommendedMax dose GBH
tlfb_cal_scr_gbh_wuString30RecommendedNumber of GBH weekend use days
tlfb_cal_scr_gbh_wtString30RecommendedGBH weekend use total
tlfb_cal_scr_gbh_ludString30RecommendedGBH last use day
tlfb_cal_scr_ecig_avgString30RecommendedAverage E-cigarettes on use days
tlfb_cal_scr_ecig_udString30RecommendedNumber of E-cigarettes use days
tlfb_cal_scr_ecig_tdString30RecommendedTotal dose E-cigarettes
tlfb_cal_scr_ecig_maxString30RecommendedMax dose E-cigarettes
tlfb_cal_scr_ecig_wuString30RecommendedNumber of E-cigarettes weekend use days
tlfb_cal_scr_ecig_wtString30RecommendedE-cigarettes weekend use total
tlfb_cal_scr_ecig_ludString30RecommendedE-cigarettes last use day
tlfb_cal_scr_mdma_avgString30RecommendedAverage Ecstasy on use days
tlfb_cal_scr_mdma_udString30RecommendedNumber of ecstasy use days
tlfb_cal_scr_mdma_tdString30RecommendedTotal dose ecstasy
tlfb_cal_scr_mdma_maxString30RecommendedMax dose ecstasy
tlfb_cal_scr_mdma_wuString30RecommendedNumber of ecstasy weekend use days
tlfb_cal_scr_mdma_wtString30RecommendedEcstasy weekend use total
tlfb_cal_scr_mdma_ludString30RecommendedEcstasy last use day
tlfb_cal_scr_hall_avgString30RecommendedAverage hallucinogens on use days
tlfb_cal_scr_hall_udString30RecommendedNumber of hallucinogens use days
tlfb_cal_scr_hall_tdString30RecommendedTotal dose hallucinogens
tlfb_cal_scr_hall_maxString30RecommendedMax dose hallucinogens
tlfb_cal_scr_hall_wuString30RecommendedNumber of hallucinogens weekend use days
tlfb_cal_scr_hall_wtString30RecommendedHallucinogens weekend use total
tlfb_cal_scr_hall_ludString30RecommendedHallucinogens last use day
tlfb_cal_scr_opiate_avgString30RecommendedAverage heroin on use days
tlfb_cal_scr_opiate_udString30RecommendedNumber of heroin use days
tlfb_cal_scr_opiate_tdString30RecommendedTotal dose heroin
tlfb_cal_scr_opiate_maxString30RecommendedMax dose heroin
tlfb_cal_scr_opiate_wuString30RecommendedNumber of heroin weekend use days
tlfb_cal_scr_opiate_wtString30RecommendedHeroin weekend use total
tlfb_cal_scr_opiate_ludString30RecommendedHeroine last use day
tlfb_cal_scr_hooka_avgString30RecommendedAverage hookah on use days
tlfb_cal_scr_hooka_udString30RecommendedNumber of hookah use days
tlfb_cal_scr_hooka_tdString30RecommendedTotal dose hookah
tlfb_cal_scr_hooka_maxString30RecommendedMax dose hookah
tlfb_cal_scr_hooka_wuString30RecommendedNumber of hookah weekend use days
tlfb_cal_scr_hooka_wtString30RecommendedHookah weekend use total
tlfb_cal_scr_hooka_ludString30RecommendedHookah last use day
tlfb_cal_scr_ot_avgString30RecommendedAverage other on use days
tlfb_cal_scr_ot_udString30RecommendedNumber of other use days
tlfb_cal_scr_ot_tdString30RecommendedTotal dose other
tlfb_cal_scr_ot_maxString30RecommendedMax dose other
tlfb_cal_scr_ot_wuString30RecommendedNumber of other weekend use days
tlfb_cal_scr_ot_wtString30RecommendedOther weekend use total
tlfb_cal_scr_ot_ludString30RecommendedOther last use day
tlfb_cal_scr_smj_avgString30RecommendedAverage smoked MJ on use days
tlfb_cal_scr_smj_udString30RecommendedNumber of smoked MJ use days
tlfb_cal_scr_smj_tdString30RecommendedTotal dose smoked MJ
tlfb_cal_scr_smj_maxString30RecommendedMax dose smoked MJ
tlfb_cal_scr_smj_wuString30RecommendedNumber of smoked MJ weekend use days
tlfb_cal_scr_smj_wtString30RecommendedSmoked MJ weekend use total
tlfb_cal_scr_smj_ludString30RecommendedSmoked MJ last use day
tlfb_cal_scr_emj_avgString30RecommendedAverage edible MJ on use days
tlfb_cal_scr_emj_udString30RecommendedNumber of edible MJ use days
tlfb_cal_scr_emj_tdString30RecommendedTotal dose edible MJ
tlfb_cal_scr_emj_maxString30RecommendedMax dose edible MJ
tlfb_cal_scr_emj_wuString30RecommendedNumber of edible MJ weekend use days
tlfb_cal_scr_emj_wtString30RecommendedEdible MJ weekend use total
tlfb_cal_scr_emj_ludString30RecommendedEdible MJ last use day
tlfb_cal_scr_k2_avgString30RecommendedAverage fake MJ on use days
tlfb_cal_scr_k2_udString30RecommendedNumber of fake MJ use days
tlfb_cal_scr_k2_tdString30RecommendedTotal dose fake MJ
tlfb_cal_scr_k2_maxString30RecommendedMax dose fake MJ
tlfb_cal_scr_k2_wuString30RecommendedNumber of fake MJ weekend use days
tlfb_cal_scr_k2_wtString30RecommendedFake MJ weekend use total
tlfb_cal_scr_k2_ludString30RecommendedFake MJ last use day
tlfb_cal_scr_dab_avgString30RecommendedAverage MJ concentrates on use days
tlfb_cal_scr_dab_udString30RecommendedNumber of MJ concentrates use days
tlfb_cal_scr_dab_tdString30RecommendedTotal dose MJ concentrates
tlfb_cal_scr_dab_maxString30RecommendedMax dose MJ concentrates
tlfb_cal_scr_dab_wuString30RecommendedNumber of MJ concentrates weekend use days
tlfb_cal_scr_dab_wtString30RecommendedMJ concentrates weekend use total
tlfb_cal_scr_dab_ludString30RecommendedMJ concentrates last use day
tlfb_cal_scr_mjalc_avgString30RecommendedAverage MJ infused alcohol drinks on use days
tlfb_cal_scr_mjalc_udString30RecommendedNumber of MJ infused alcohol drinks on use days
tlfb_cal_scr_mjalc_tdString30RecommendedTotal dose MJ infused alcohol drinks
tlfb_cal_scr_mjalc_maxString30RecommendedMax dose MJ infused alcohol drinks
tlfb_cal_scr_mjalc_wuString30RecommendedNumber of MJ infused alcohol drinks weekend use days
tlfb_cal_scr_mjalc_wtString30RecommendedMJ infused alcohol drinks weekend use total
tlfb_cal_scr_mjalc_ludString30RecommendedMJ infused alcohol drinks last use day
tlfb_cal_scr_mjt_avgString30RecommendedAverage MJ tincture on use days
tlfb_cal_scr_mjt_udString30RecommendedNumber of MJ tincture use days
tlfb_cal_scr_mjt_tdString30RecommendedTotal dose MJ tincture
tlfb_cal_scr_mjt_maxString30RecommendedMax dose MJ tincture
tlfb_cal_scr_mjt_wuString30RecommendedNumber of MJ tincture weekend use days
tlfb_cal_scr_mjt_wtString30RecommendedMJ tincture weekend use total
tlfb_cal_scr_mjt_ludString30RecommendedMJ tincture last use day
tlfb_cal_scr_stimrx_avgString30RecommendedAverage stimulant medications on use days
tlfb_cal_scr_stimrx_udString30RecommendedNumber of stimulant medication use days
tlfb_cal_scr_stimrx_tdString30RecommendedTotal dose stimulant medications
tlfb_cal_scr_stimrx_maxString30RecommendedMax dose stimulant medications
tlfb_cal_scr_stimrx_wuString30RecommendedNumber of stimulant medications weekend use days
tlfb_cal_scr_stimrx_wtString30RecommendedStimulant medications weekend use total
tlfb_cal_scr_stimrx_ludString30RecommendedStimulant medication last use day
tlfb_cal_scr_meth_avgString30RecommendedAverage Methamphetamine on use days
tlfb_cal_scr_meth_udString30RecommendedNumber of Methamphetamine use days
tlfb_cal_scr_meth_tdString30RecommendedTotal dose Methamphetamine
tlfb_cal_scr_meth_maxString30RecommendedMax dose Methamphetamines
tlfb_cal_scr_meth_wuString30RecommendedNumber of Methamphetamine weekend use days
tlfb_cal_scr_meth_wtString30RecommendedMethamphetamine weekend use total
tlfb_cal_scr_meth_ludString30RecommendedMethamphetamine last use day
tlfb_cal_scr_chew_avgString30RecommendedAverage tobacco chewed on use days
tlfb_cal_scr_chew_udString30RecommendedNumber of tobacco chewed use days
tlfb_cal_scr_chew_tdString30RecommendedTotal dose tobacco chewed
tlfb_cal_scr_chew_maxString30RecommendedMax dose tobacco chewed
tlfb_cal_scr_chew_wuString30RecommendedNumber of tobacco chewed weekend use days
tlfb_cal_scr_chew_wtString30RecommendedTobacco chewed weekend use total
tlfb_cal_scr_chew_ludString30RecommendedTobacco chewed last use day
tlfb_cal_scr_cig_avgString30RecommendedAverage tobacco smoked on use days
tlfb_cal_scr_cig_udString30RecommendedNumber of tobacco smoked use days
tlfb_cal_scr_cig_tdString30RecommendedTotal dose tobacco smoked
tlfb_cal_scr_cig_maxString30RecommendedMax dose tobacco smoked
tlfb_cal_scr_cig_wuString30RecommendedNumber of tobacco smoked weekend use days
tlfb_cal_scr_cig_wtString30RecommendedTobacco smoked weekend use total
tlfb_cal_scr_cig_ludString30RecommendedTobacco smoked last use day
tlfb_cal_scr_sedrx_avgString30RecommendedAverage tranquilizers or sedatives on use days
tlfb_cal_scr_sedrx_udString30RecommendedNumber of tranquilizers or sedatives use days
tlfb_cal_scr_sedrx_tdString30RecommendedTotal dose tranquilizers or sedatives
tlfb_cal_scr_sedrx_maxString30RecommendedMax dose tranquilizers or sedatives
tlfb_cal_scr_sedrx_wuString30RecommendedNumber of tranquilizer weekend use days
tlfb_cal_scr_sedrx_wtString30RecommendedTranquilizer weekend use total
tlfb_cal_scr_sedrx_ludString30RecommendedTranquilizer last use day
tlfb_cal_scr_co_mjsd_drinksString30RecommendedAverage marijuana and standard drinks co-use drinks
tlfb_cal_scr_co_mjsd_mjString30RecommendedAverage marijuana and standard drinks co-use marijuana (grams)
tlfb_cal_scr_co_mjsd_numString30RecommendedNumber of co-use days of Marijuana and Alcohol
tlfb_cal_scr_co_tomj_toString30RecommendedAverage tobacco and marijuana co-use tobacco occasions
tlfb_cal_scr_co_tomj_mjString30RecommendedAverage tobacco and canabis co-use canabis occasions
tlfb_cal_scr_co_tomj_numString30RecommendedNumber of co-use days of Tobacco and Canabis
tlfb_cal_scr_co_toal_toString30RecommendedAverage Tobacco and Alcohol co-use Tobacco occasions
tlfb_cal_scr_co_toal_alString30RecommendedAverage Tobacco and Alcohol co-use Alcohol occasions
tlfb_cal_scr_co_toal_numString30RecommendedNumber of co-use days of Tobacco and Alcohol
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: abcd_tlfb01 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.