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Frequently Asked Questions


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Filter Cart

The Filter Cart provides a powerful way to query and access data for which you may be interested.  

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 run a query, it may take a moment to populate but this will happen in the background so you can define other queries 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 structures or collections 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 shown.  To see other data structures, select "Find All Subject Data" which will query all data for those subjects. When a secord or third filter is applied, an AND condition is used.  A subject must exist in all filters.  If the subject does not appear in any one filter, that subjects data will not be included in your filter cart. If that happens, clear your filter cart, and start over.  

It is best to package more data than you need and access those data using other tools, independent of the NDA (e.g. miNDAR snapshot), to limit the data selected.  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)



Time line followup back calendar scores

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_dateDateRecommendedAssessment Date
tlfb_cal_scr_num_eventsIntegerRecommendedNumber of recorded substance used events. Multiple usages per day for a substance are pooled together.
tlfb_cal_scr_num_bdeIntegerRecommendedNumber of binge drinking episodes (use per event >= 4 for female, >= 5 for male)
tlfb_cal_scr_tot_bdeIntegerRecommendedBinge drinking episodes total use
tlfb_cal_scr_drinksperbingeFloatRecommendedBinge drinks per binge occasion
tlfb_cal_scr_alc_avgFloatRecommendedAverage standard drinks on use days
tlfb_cal_scr_alc_udFloatRecommendedNumber of standard drinks use days
tlfb_cal_scr_alc_tdFloatRecommendedTotal dose standard drinks
tlfb_cal_scr_alc_maxFloatRecommendedMax dose standard drinks
tlfb_cal_scr_alc_wuFloatRecommendedNumber of standard drinks weekend use days
tlfb_cal_scr_alc_wtFloatRecommendedStandard drinks weekend use total
tlfb_cal_scr_alc_ludString30RecommendedStandard drinks last use day
tlfb_cal_scr_opiaterx_avgFloatRecommendedAverage pain relievers on use days
tlfb_cal_scr_opiaterx_udFloatRecommendedNumber of pain relievers use days
tlfb_cal_scr_opiaterx_tdFloatRecommendedTotal dose pain relievers
tlfb_cal_scr_opiaterx_maxFloatRecommendedMax dose pain relievers
tlfb_cal_scr_opiaterx_wuFloatRecommendedNumber of pain relievers weekend use
tlfb_cal_scr_opiaterx_wtFloatRecommendedPain relievers weekend use total
tlfb_cal_scr_opiaterx_ludString30RecommendedPain relievers last use day
tlfb_cal_scr_blunt_avgFloatRecommendedAverage blunts on use days
tlfb_cal_scr_blunt_udFloatRecommendedNumber of blunts use days
tlfb_cal_scr_blunt_tdFloatRecommendedTotal dose blunts
tlfb_cal_scr_blunt_maxFloatRecommendedMax dose blunts
tlfb_cal_scr_blunt_wuFloatRecommendedNumber of blunts weekend use days
tlfb_cal_scr_blunt_wtFloatRecommendedBlunts weekend use total
tlfb_cal_scr_blunt_ludString30RecommendedBlunt last use day
tlfb_cal_scr_ket_avgFloatRecommendedAverage Ketamine on use days
tlfb_cal_scr_ket_udFloatRecommendedNumber of Ketamine use days
tlfb_cal_scr_ket_tdFloatRecommendedTotal dose Ketamine
tlfb_cal_scr_ket_maxFloatRecommendedMax dose Ketamine
tlfb_cal_scr_ket_wuFloatRecommendedNumber of Ketamine weekend use days
tlfb_cal_scr_ket_wtFloatRecommendedKetamine weekend use total
tlfb_cal_scr_ket_ludString30RecommendedKetamine last use day
tlfb_cal_scr_nicrx_avgFloatRecommendedAverage nicotine replacements on use days
tlfb_cal_scr_nicrx_udFloatRecommendedNumber of nicotine replacement use days
tlfb_cal_scr_nicrx_tdFloatRecommendedTotal dose nicotine replacements
tlfb_cal_scr_nicrx_maxFloatRecommendedMax dose nicotine replacements
tlfb_cal_scr_nicrx_wuFloatRecommendedNumber of nicotine replacements weekend use days
tlfb_cal_scr_nicrx_wtFloatRecommendedNicotine replacements weekend use total
tlfb_cal_scr_nicrx_ludString30RecommendedNicotine replacements last use day
tlfb_cal_scr_bthslt_avgFloatRecommendedAverage cathiones on use days
tlfb_cal_scr_bthslt_udFloatRecommendedNumber of cathiones use days
tlfb_cal_scr_bthslt_tdFloatRecommendedTotal dose cathiones
tlfb_cal_scr_bthslt_maxFloatRecommendedMax dose cathiones
tlfb_cal_scr_bthslt_wuFloatRecommendedNumber of cathiones weekend use days
tlfb_cal_scr_bthslt_wtFloatRecommendedCathiones weekend use total
tlfb_cal_scr_bthslt_ludString30RecommendedCathiones last use day
tlfb_cal_scr_fake_avgFloatRecommendedAverage bittamugen on use days
tlfb_cal_scr_fake_udFloatRecommendedNumber of bittamugen use days
tlfb_cal_scr_fake_tdFloatRecommendedTotal dose bittamugen
tlfb_cal_scr_fake_maxFloatRecommendedMax dose bittamugen
tlfb_cal_scr_fake_wuFloatRecommendedNumber of bittamugen weekend use days
tlfb_cal_scr_fake_wtFloatRecommendedBittamugen weekend use total
tlfb_cal_scr_fake_ludString30RecommendedBittamugen last use day
tlfb_cal_scr_roid_avgFloatRecommendedAverage steroids on use days
tlfb_cal_scr_roid_udFloatRecommendedNumber of steroids use days
tlfb_cal_scr_roid_tdFloatRecommendedTotal dose steroids
tlfb_cal_scr_roid_maxFloatRecommendedMax dose steroids
tlfb_cal_scr_roid_wuFloatRecommendedNumber of steroids weekend use days
tlfb_cal_scr_roid_wtFloatRecommendedSteroids weekend use total
tlfb_cal_scr_roid_ludString30RecommendedSteroids last use day
tlfb_cal_scr_inhal_avgFloatRecommendedAverage inhalants on use days
tlfb_cal_scr_inhal_udFloatRecommendedNumber of inhalants use days
tlfb_cal_scr_inhal_tdFloatRecommendedTotal dose inhalants
tlfb_cal_scr_inhal_maxFloatRecommendedMax dose inhalants
tlfb_cal_scr_inhal_wuFloatRecommendedNumber of inhalants weekend use days
tlfb_cal_scr_inhal_wtFloatRecommendedInhalants weekend use total
tlfb_cal_scr_inhal_ludString30RecommendedInhalants last use day
tlfb_cal_scr_shroom_avgFloatRecommendedAverage magic mushrooms on use days
tlfb_cal_scr_shroom_udFloatRecommendedNumber of magic mushrooms use days
tlfb_cal_scr_shroom_tdFloatRecommendedTotal dose magic mushrooms
tlfb_cal_scr_shroom_maxFloatRecommendedMax dose magic mushrooms
tlfb_cal_scr_shroom_wuFloatRecommendedNumber of magic mushrooms weekend use days
tlfb_cal_scr_shroom_wtFloatRecommendedMagic mushrooms weekend use total
tlfb_cal_scr_shroom_ludString30RecommendedMagic mushrooms last use day
tlfb_cal_scr_sal_avgFloatRecommendedAverage saliva on use days
tlfb_cal_scr_sal_udFloatRecommendedNumber of saliva use days
tlfb_cal_scr_sal_tdFloatRecommendedTotal dose saliva
tlfb_cal_scr_sal_maxFloatRecommendedMax dose saliva
tlfb_cal_scr_sal_wuFloatRecommendedNumber of saliva weekend use days
tlfb_cal_scr_sal_wtFloatRecommendedSaliva weekend use total
tlfb_cal_scr_sal_ludString30RecommendedSaliva last use day
tlfb_cal_scr_cg_avgFloatRecommendedAverage cigars on use days
tlfb_cal_scr_cg_udFloatRecommendedNumber of cigars use days
tlfb_cal_scr_cg_tdFloatRecommendedTotal dose cigars
tlfb_cal_scr_cg_maxFloatRecommendedMax dose cigars
tlfb_cal_scr_cg_wuFloatRecommendedNumber of cigars weekend use days
tlfb_cal_scr_cg_wtFloatRecommendedCigars weekend use total
tlfb_cal_scr_cg_ludString30RecommendedCigars last use day
tlfb_cal_scr_pipe_avgFloatRecommendedAverage pipe tobacco on use days
tlfb_cal_scr_pipe_udFloatRecommendedNumber of pipe tobacco use days
tlfb_cal_scr_pipe_tdFloatRecommendedTotal dose pipe tobacco
tlfb_cal_scr_pipe_maxFloatRecommendedMax dose pipe tobacco
tlfb_cal_scr_pipe_wuFloatRecommendedNumber of pipe tobacco weekend use days
tlfb_cal_scr_pipe_wtFloatRecommendedPipe tobacco weekend use total
tlfb_cal_scr_pipe_ludString30RecommendedPipe tobacco last use days
tlfb_cal_scr_dxm_avgFloatRecommendedAverage cough or cold medicine on use days
tlfb_cal_scr_dxm_udFloatRecommendedNumber of cough or cold medicine use days
tlfb_cal_scr_dxm_tdFloatRecommendedTotal dose cough or cold medicine
tlfb_cal_scr_dxm_maxFloatRecommendedMax dose cough or cold medicine
tlfb_cal_scr_dxm_wuFloatRecommendedNumber of cough or cold medicine weekend use days
tlfb_cal_scr_dxm_wtFloatRecommendedCough or cold medicine weekend use total
tlfb_cal_scr_dxm_ludString30RecommendedCough and cold medicine last use day
tlfb_cal_scr_coc_avgFloatRecommendedAverage cocaine on use days
tlfb_cal_scr_coc_udFloatRecommendedNumber of cocaine use days
tlfb_cal_scr_coc_tdFloatRecommendedTotal dose cocaine
tlfb_cal_scr_coc_maxFloatRecommendedMax dose cocaine
tlfb_cal_scr_coc_wuFloatRecommendedNumber of cocaine weekend use days
tlfb_cal_scr_coc_wtFloatRecommendedCocaine weekend use total
tlfb_cal_scr_coc_ludString30RecommendedCocaine last use day
tlfb_cal_scr_gbh_avgFloatRecommendedAverage GBH on use days
tlfb_cal_scr_gbh_udFloatRecommendedNumber of GBH use days
tlfb_cal_scr_gbh_tdFloatRecommendedTotal dose GBH
tlfb_cal_scr_gbh_maxFloatRecommendedMax dose GBH
tlfb_cal_scr_gbh_wuFloatRecommendedNumber of GBH weekend use days
tlfb_cal_scr_gbh_wtFloatRecommendedGBH weekend use total
tlfb_cal_scr_gbh_ludString30RecommendedGBH last use day
tlfb_cal_scr_ecig_avgFloatRecommendedAverage E-cigarettes on use days
tlfb_cal_scr_ecig_udFloatRecommendedNumber of E-cigarettes use days
tlfb_cal_scr_ecig_tdFloatRecommendedTotal dose E-cigarettes
tlfb_cal_scr_ecig_maxFloatRecommendedMax dose E-cigarettes
tlfb_cal_scr_ecig_wuFloatRecommendedNumber of E-cigarettes weekend use days
tlfb_cal_scr_ecig_wtFloatRecommendedE-cigarettes weekend use total
tlfb_cal_scr_ecig_ludString30RecommendedE-cigarettes last use day
tlfb_cal_scr_mdma_avgFloatRecommendedAverage Ecstasy on use days
tlfb_cal_scr_mdma_udFloatRecommendedNumber of ecstasy use days
tlfb_cal_scr_mdma_tdFloatRecommendedTotal dose ecstasy
tlfb_cal_scr_mdma_maxFloatRecommendedMax dose ecstasy
tlfb_cal_scr_mdma_wuFloatRecommendedNumber of ecstasy weekend use days
tlfb_cal_scr_mdma_wtFloatRecommendedEcstasy weekend use total
tlfb_cal_scr_mdma_ludString30RecommendedEcstasy last use day
tlfb_cal_scr_hall_avgFloatRecommendedAverage hallucinogens on use days
tlfb_cal_scr_hall_udFloatRecommendedNumber of hallucinogens use days
tlfb_cal_scr_hall_tdFloatRecommendedTotal dose hallucinogens
tlfb_cal_scr_hall_maxFloatRecommendedMax dose hallucinogens
tlfb_cal_scr_hall_wuFloatRecommendedNumber of hallucinogens weekend use days
tlfb_cal_scr_hall_wtFloatRecommendedHallucinogens weekend use total
tlfb_cal_scr_hall_ludString30RecommendedHallucinogens last use day
tlfb_cal_scr_opiate_avgFloatRecommendedAverage heroin on use days
tlfb_cal_scr_opiate_udFloatRecommendedNumber of heroin use days
tlfb_cal_scr_opiate_tdFloatRecommendedTotal dose heroin
tlfb_cal_scr_opiate_maxFloatRecommendedMax dose heroin
tlfb_cal_scr_opiate_wuFloatRecommendedNumber of heroin weekend use days
tlfb_cal_scr_opiate_wtFloatRecommendedHeroin weekend use total
tlfb_cal_scr_opiate_ludString30RecommendedHeroine last use day
tlfb_cal_scr_hooka_avgFloatRecommendedAverage hookah on use days
tlfb_cal_scr_hooka_udFloatRecommendedNumber of hookah use days
tlfb_cal_scr_hooka_tdFloatRecommendedTotal dose hookah
tlfb_cal_scr_hooka_maxFloatRecommendedMax dose hookah
tlfb_cal_scr_hooka_wuFloatRecommendedNumber of hookah weekend use days
tlfb_cal_scr_hooka_wtFloatRecommendedHookah weekend use total
tlfb_cal_scr_hooka_ludString30RecommendedHookah last use day
tlfb_cal_scr_ot_avgFloatRecommendedAverage other on use days
tlfb_cal_scr_ot_udFloatRecommendedNumber of other use days
tlfb_cal_scr_ot_tdFloatRecommendedTotal dose other
tlfb_cal_scr_ot_maxFloatRecommendedMax dose other
tlfb_cal_scr_ot_wuFloatRecommendedNumber of other weekend use days
tlfb_cal_scr_ot_wtFloatRecommendedOther weekend use total
tlfb_cal_scr_ot_ludString30RecommendedOther last use day
tlfb_cal_scr_smj_avgFloatRecommendedAverage smoked MJ on use days
tlfb_cal_scr_smj_udFloatRecommendedNumber of smoked MJ use days
tlfb_cal_scr_smj_tdFloatRecommendedTotal dose smoked MJ
tlfb_cal_scr_smj_maxFloatRecommendedMax dose smoked MJ
tlfb_cal_scr_smj_wuFloatRecommendedNumber of smoked MJ weekend use days
tlfb_cal_scr_smj_wtFloatRecommendedSmoked MJ weekend use total
tlfb_cal_scr_smj_ludString30RecommendedSmoked MJ last use day
tlfb_cal_scr_emj_avgFloatRecommendedAverage edible MJ on use days
tlfb_cal_scr_emj_udFloatRecommendedNumber of edible MJ use days
tlfb_cal_scr_emj_tdFloatRecommendedTotal dose edible MJ
tlfb_cal_scr_emj_maxFloatRecommendedMax dose edible MJ
tlfb_cal_scr_emj_wuFloatRecommendedNumber of edible MJ weekend use days
tlfb_cal_scr_emj_wtFloatRecommendedEdible MJ weekend use total
tlfb_cal_scr_emj_ludString30RecommendedEdible MJ last use day
tlfb_cal_scr_k2_avgFloatRecommendedAverage synthetic MJ on use days
tlfb_cal_scr_k2_udFloatRecommendedNumber of synthetic MJ use days
tlfb_cal_scr_k2_tdFloatRecommendedTotal dose synthetic MJ
tlfb_cal_scr_k2_maxFloatRecommendedMax dose synthetic MJ
tlfb_cal_scr_k2_wuFloatRecommendedNumber of synthetic MJ weekend use days
tlfb_cal_scr_k2_wtFloatRecommendedSynthetic MJ weekend use total
tlfb_cal_scr_k2_ludString30RecommendedSynthetic MJ last use day
tlfb_cal_scr_dab_avgFloatRecommendedAverage MJ concentrates on use days
tlfb_cal_scr_dab_udFloatRecommendedNumber of MJ concentrates use days
tlfb_cal_scr_dab_tdFloatRecommendedTotal dose MJ concentrates
tlfb_cal_scr_dab_maxFloatRecommendedMax dose MJ concentrates
tlfb_cal_scr_dab_wuFloatRecommendedNumber of MJ concentrates weekend use days
tlfb_cal_scr_dab_wtFloatRecommendedMJ 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_udFloatRecommendedNumber of MJ infused alcohol drinks on use days
tlfb_cal_scr_mjalc_tdFloatRecommendedTotal dose MJ infused alcohol drinks
tlfb_cal_scr_mjalc_maxFloatRecommendedMax dose MJ infused alcohol drinks
tlfb_cal_scr_mjalc_wuFloatRecommendedNumber of MJ infused alcohol drinks weekend use days
tlfb_cal_scr_mjalc_wtFloatRecommendedMJ infused alcohol drinks weekend use total
tlfb_cal_scr_mjalc_ludString30RecommendedMJ infused alcohol drinks last use day
tlfb_cal_scr_mjt_avgFloatRecommendedAverage MJ tincture on use days
tlfb_cal_scr_mjt_udFloatRecommendedNumber of MJ tincture use days
tlfb_cal_scr_mjt_tdFloatRecommendedTotal dose MJ tincture
tlfb_cal_scr_mjt_maxFloatRecommendedMax dose MJ tincture
tlfb_cal_scr_mjt_wuFloatRecommendedNumber of MJ tincture weekend use days
tlfb_cal_scr_mjt_wtFloatRecommendedMJ tincture weekend use total
tlfb_cal_scr_mjt_ludString30RecommendedMJ tincture last use day
tlfb_cal_scr_stimrx_avgFloatRecommendedAverage stimulant medications on use days
tlfb_cal_scr_stimrx_udFloatRecommendedNumber of stimulant medication use days
tlfb_cal_scr_stimrx_tdFloatRecommendedTotal dose stimulant medications
tlfb_cal_scr_stimrx_maxFloatRecommendedMax dose stimulant medications
tlfb_cal_scr_stimrx_wuFloatRecommendedNumber of stimulant medications weekend use days
tlfb_cal_scr_stimrx_wtFloatRecommendedStimulant medications weekend use total
tlfb_cal_scr_stimrx_ludString30RecommendedStimulant medication last use day
tlfb_cal_scr_meth_avgFloatRecommendedAverage Methamphetamine on use days
tlfb_cal_scr_meth_udFloatRecommendedNumber of Methamphetamine use days
tlfb_cal_scr_meth_tdFloatRecommendedTotal dose Methamphetamine
tlfb_cal_scr_meth_maxFloatRecommendedMax dose Methamphetamines
tlfb_cal_scr_meth_wuFloatRecommendedNumber of Methamphetamine weekend use days
tlfb_cal_scr_meth_wtFloatRecommendedMethamphetamine weekend use total
tlfb_cal_scr_meth_ludString30RecommendedMethamphetamine last use day
tlfb_cal_scr_chew_avgFloatRecommendedAverage tobacco chewed on use days
tlfb_cal_scr_chew_udFloatRecommendedNumber of tobacco chewed use days
tlfb_cal_scr_chew_tdFloatRecommendedTotal dose tobacco chewed
tlfb_cal_scr_chew_maxFloatRecommendedMax dose tobacco chewed
tlfb_cal_scr_chew_wuFloatRecommendedNumber of tobacco chewed weekend use days
tlfb_cal_scr_chew_wtFloatRecommendedTobacco chewed weekend use total
tlfb_cal_scr_chew_ludString30RecommendedTobacco chewed last use day
tlfb_cal_scr_cig_avgFloatRecommendedAverage tobacco smoked on use days
tlfb_cal_scr_cig_udFloatRecommendedNumber of tobacco smoked use days
tlfb_cal_scr_cig_tdFloatRecommendedTotal dose tobacco smoked
tlfb_cal_scr_cig_maxFloatRecommendedMax dose tobacco smoked
tlfb_cal_scr_cig_wuFloatRecommendedNumber of tobacco smoked weekend use days
tlfb_cal_scr_cig_wtFloatRecommendedTobacco smoked weekend use total
tlfb_cal_scr_cig_ludString30RecommendedTobacco smoked last use day
tlfb_cal_scr_sedrx_avgFloatRecommendedAverage tranquilizers or sedatives on use days
tlfb_cal_scr_sedrx_udFloatRecommendedNumber of tranquilizers or sedatives use days
tlfb_cal_scr_sedrx_tdFloatRecommendedTotal dose tranquilizers or sedatives
tlfb_cal_scr_sedrx_maxFloatRecommendedMax dose tranquilizers or sedatives
tlfb_cal_scr_sedrx_wuFloatRecommendedNumber of tranquilizer weekend use days
tlfb_cal_scr_sedrx_wtFloatRecommendedTranquilizer weekend use total
tlfb_cal_scr_sedrx_ludString30RecommendedTranquilizer last use day
tlfb_cal_scr_co_mjsd_drinksFloatRecommendedAverage marijuana and standard drinks co-use drinks
tlfb_cal_scr_co_mjsd_mjFloatRecommendedAverage marijuana and standard drinks co-use marijuana (grams)
tlfb_cal_scr_co_mjsd_numIntegerRecommendedNumber of co-use days of Marijuana and Alcohol
tlfb_cal_scr_co_tomj_toFloatRecommendedAverage tobacco and marijuana co-use tobacco occasions
tlfb_cal_scr_co_tomj_mjFloatRecommendedAverage tobacco and canabis co-use canabis occasions
tlfb_cal_scr_co_tomj_numIntegerRecommendedNumber of co-use days of Tobacco and Canabis
tlfb_cal_scr_co_toal_toFloatRecommendedAverage Tobacco and Alcohol co-use Tobacco occasions
tlfb_cal_scr_co_toal_alFloatRecommendedAverage Tobacco and Alcohol co-use Alcohol occasions
tlfb_cal_scr_co_toal_numIntegerRecommendedNumber 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.