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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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Means Accesebility Questionnare

blq

01

Baseline questionnaire for family member or friend

Download Definition as
Download Submission Template as
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/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.
sexString20RequiredSex of the subject
M;F
M = Male; F = Femalegender
aescodeIntegerRecommendedStaff code number of person completing this form
version_formString100RecommendedForm used/assessment name
relashionshipString255Recommendedrelashionship of respondent to individual
blq1IntegerRecommendedToday, would you say that All, Some, or None the medicines in your home are stored unlocked?0::3;80 = No medicines at home; 1 = All are stored unlocked; 2 = Some are stored unlocked; 3 = None are stored unlocked; 8 = Don't Know
blq2bIntegerRecommendedYou said some medicines in your home are stored unlocked. I'm going to read some types of medications. For each type, please tell me whether None, Some, or All are stored unlocked. - Prescription pain medications0::2;80 = None; 1 = Some; 2 = All; 8 = Don't Know
blq2cIntegerRecommendedYou said some medicines in your home are stored unlocked. I'm going to read some types of medications. For each type, please tell me whether None, Some, or All are stored unlocked. - Other prescription medications0::2;80 = None; 1 = Some; 2 = All; 8 = Don't Know
blq2dIntegerRecommendedYou said some medicines in your home are stored unlocked. I'm going to read some types of medications. For each type, please tell me whether None, Some, or All are stored unlocked. - Over-the-counter pain medications0::2;80 = None; 1 = Some; 2 = All; 8 = Don't Know
blq2eIntegerRecommendedYou said some medicines in your home are stored unlocked. I'm going to read some types of medications. For each type, please tell me whether None, Some, or All are stored unlocked. - Other over-the-counter medications0::2;80 = None; 1 = Some; 2 = All; 8 = Don't Know
blq3IntegerRecommendedIf at least some medications are locked, could you access any of the locked medications?0::2;80 = No; 1 = Yes, easily; 2 = Yes, but it might be difficult; 8 = Don't Know
blq4IntegerRecommendedToday, how many firearms do you have in your home - one or more than one?1::3;81 = One; 2 = More than one; 3 = None; 8 = Don't Knowbl_guns
blq4aIntegerRecommendedIf your home has only one gun, is this gun stored unlocked?0;1;80 = No; 1 = Yes; 8 = Don't Know
blq4bIntegerRecommendedIf your home has only one gun, is this gun stored loaded?0;1;80 = No; 1 = Yes; 8 = Don't Know
blq4cIntegerRecommendedIf your home has more than one gun, how many of these guns are stored unlocked?0;1;2;80 = None; 1 = One; 2 = More than one; 8= Don't Know
blq4dIntegerRecommendedIf your home has more than one gun, how many of the guns you have at home are stored loaded?0;1;2;80 = None; 1 = One; 2 = More than one; 8 = Don't Know
blq4eIntegerRecommendedIf your home has an unknown number of guns, to the best of your knowledge, is there at least one gun in your home stored unlocked?0;10 = No; 1 = Yes
blq4fIntegerRecommendedIf your home has an unknown number of guns, to the best of your knowledge, is there at least one gun in your home stored loaded?0;10 = No; 1 = Yes
blq4gString20RecommendedFor any guns that are locked, can you please describe which devices are used? (Check all that apply)1 = Gun safe; 2 = Locked closet or cabinet; 3 = Locked room; 4 = Locking device like cable lock or trigger lock; 5 = Intrinsic lock; 8 = Don't Know
blq5IntegerRecommendedFor any guns that are locked, could you personally unlock at least one?0::2;80 = No; 1 = Yes, easily; 2 = Yes, but it might be difficult; 8 = Don't Know
blq6IntegerRecommendedDo you have any guns stored away from your home?0;1;80 = No; 1 = Yes; 8 = Don't Know
blq6bString25RecommendedIf you have guns stored away from your home, where are they currently stored?1 = At a relative's home; 2 = At a friend's home; 3 = At a gun range or sports club; 4 = At a gun store; 5 = With the police/law enforcement; 6 = At a pawn shop; 7 = Other; 9 = Refused; 8 = Don't know
blq6b_otherString50RecommendedIf you have guns stored away from your home, where are they currently stored? Other: specify
blq7IntegerRecommendedDo you personally own the guns we've been talking about?0::2; 8;90 = No; 1 = Yes, at least one but not all; 2 = Yes, all of them; 9 = Refused; 8 = Don't know
blq8IntegerRecommendedWho makes decisions about how guns in your home are stored?1::3;8;91 = I do, by myself; 2 = I do, with someone else in the home; 3 = Someone else in the home does; 9 = Refused; 8 = Don't know/not sure
blq8bString25RecommendedIf someone else makes or helps to make decisions about how guns in your home are stored, who is that person? (Choose all that apply)1 = My spouse/partner/significant other; 2 = Brother/brother-in-law; 3 = Sister/sister-in-law; 4 = Parent/parent-in-law; 5 = Adult child (at least 18 years old); 6 = Child; 7 = Other adult (including roommates or friends); 9 = Refused; 8 = Don't know
blq8cIntegerRecommendedIf someone else makes or helps to make decisions about how guns in your home are stored, is/was that person in the ER with you today?0;1;8;90 = No; 1 = Yes; 9 = Refused; 8 = Don't know/not sure
blq9IntegerRecommendedDo you remember any ER provider talking with you today how you store medications in your home?0;1;8;90 = No; 1 = Yes; 9 = Refused; 8 = Don't know/not sure
blq10IntegerRecommendedDo you remember any ER provider talking with you today whether you have access to guns at home?0;1;8;90 = No; 1 = Yes; 9 = Refused; 8 = Don't know/not sure
blq11bIntegerRecommendedHow much do you agree with the following statements: Having access to a gun in the home increases the likelihood of death by suicide when someone is at risk1::51 = Strongly agree; 2 = Agree; 3 = Neither agree nor disagree; 4 = Disagree; 5 = Strongly disagree
blq11cIntegerRecommendedHow much do you agree with the following statements: Locking up firearms or storing them away from the home reduces the likelihood of death by suicide when someone is at risk1::51 = Strongly agree; 2 = Agree; 3 = Neither agree nor disagree; 4 = Disagree; 5 = Strongly disagree
blq12IntegerRecommendedFor every 10 people who survive a suicide attempt, how many do you think will later die by suicide?1;3;5;7;91 = One; 3 = Three; 5 = Five; 7 = Seven; 9 = Nine
blq13IntegerRecommendedFor every 10 people who attempt suicide using a gun, how many (on average) do you think will die?1;3;5;7;91 = One; 3 = Three; 5 = Five; 7 = Seven; 9 = Nine
blq14aIntegerRecommendedConsidering the firearm storage option(s) you prefer: Do you know which options are available to you?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14bIntegerRecommendedConsidering the firearm storage option(s) you prefer: Do you know the benefits of each option?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14cIntegerRecommendedConsidering the firearm storage option(s) you prefer: Do you know the risks or drawbacks of each option?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14dIntegerRecommendedConsidering the firearm storage option(s) you prefer: Are you clear about which benefits matter most to me?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14eIntegerRecommendedConsidering the firearm storage option(s) you prefer: Are you clear about which risks and drawbacks matter to me?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14fIntegerRecommendedConsidering the firearm storage option(s) you prefer: Do you have enough support from others to make a choice?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14gIntegerRecommendedConsidering the firearm storage option(s) you prefer: Are you choosing without pressure from others?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14hIntegerRecommendedConsidering the firearm storage option(s) you prefer: Do you have enough advice to make a choice?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14iIntegerRecommendedConsidering the firearm storage option(s) you prefer: Are you clear about the best choice for you?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14jIntegerRecommendedConsidering the firearm storage option(s) you prefer: Do you feel sure about what to choose?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14kIntegerRecommendedConsidering the firearm storage option(s) you prefer: Is this decision easy for you to make?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14lIntegerRecommendedConsidering the firearm storage option(s) you prefer: Do you feel you have made an informed choice?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14mIntegerRecommendedConsidering the firearm storage option(s) you prefer: Does your decision who what is important to you?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14nIntegerRecommendedConsidering the firearm storage option(s) you prefer: Do you expect to stick with your decision?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq14oIntegerRecommendedConsidering the firearm storage option(s) you prefer: Are you satisfied with your decision?
0;1;3
0 = No; 1 = Yes; 3 = Unsure
blq15aIntegerRecommendedI feel confident that I can: Get the facts about the firearm storage choices available to me1::51 = Not at all confident; 5 = Very confident
blq15bIntegerRecommendedI feel confident that I can: Get the facts about the benefits of each choice1::51 = Not at all confident; 5 = Very confident
blq15cIntegerRecommendedI feel confident that I can: Get the facts about the risks and downsides of each choice1::51 = Not at all confident; 5 = Very confident
blq15dIntegerRecommendedI feel confident that I can: Understand the information enough to be able to make a choice1::51 = Not at all confident; 5 = Very confident
blq15eIntegerRecommendedI feel confident that I can: Ask questions without feeling dumb1::51 = Not at all confident; 5 = Very confident
blq15fIntegerRecommendedI feel confident that I can: Express my concerns about each choice1::51 = Not at all confident; 5 = Very confident
blq15gIntegerRecommendedI feel confident that I can: Ask for advice1::51 = Not at all confident; 5 = Very confident
blq15hIntegerRecommendedI feel confident that I can: Figure out the choice that best suits me1::51 = Not at all confident; 5 = Very confident
blq15iIntegerRecommendedI feel confident that I can: Handle unwanted pressure from others in making my choice1::51 = Not at all confident; 5 = Very confident
blq16aIntegerRecommendedAfter today's visit, how likely is it that you will change the way you store these things at home? - Medications1::7;91 = Extremely likely; 7 = Extremely unlikely; -888 = I don't have any potentially toxic medications
blq16bIntegerRecommendedAfter today's visit, how likely is it that you will change the way you store these things at home? - Firearms1::71 = Extremely likely; 7 = Extremely unlikely
blq16cString20RecommendedIf the likelihood of changing firearm storage habits was 1 - 5 (moderately to extremely likely), what changes do you think you will make? Choose all that apply0 = I will use a/more locking devices (such as trigger locks) in my home; 1 = I will use a/more locking safes or gun lockboxes in my home; 2 = I will give a/more guns to a trusted family member for safekeeping; 3 = I will give a/more guns to a trusted friend for safekeeping; 4 = I will store a/more guns at a store or range that has firearm storage; 5 = I will give a /more guns to a law enforcement agency that has firearm storage; 7 = Other; NA - not applicable
blq16c_otherString665RecommendedIf the likelihood of changing firearm storage habits was 1 - 5 (moderately to extremely likely), what changes do you think you will make? Choose all that apply - Other: specify
blq16dString300RecommendedIf the likelihood of changing firearm storage habits was 6 or 7 (change extremely unlikely), why is it unlikely that you will make changes?
blq17IntegerRecommendedThe length of the web tool was1::3;8;91 = Too long; 2 = Just right; 3 = Too short; 98 = Refused; 97 = Don't know
blq18IntegerRecommendedThe amount of information was1::3;8;91 = Too much information; 2 = Just right; 3 = Too little information; 9 = Refused; 8 = Don't know
blq19IntegerRecommendedI found the web tool1::3;8;91 = Slanted towards option in the home (locked up and inaccessible to the person at risk); 2 = Slanted towards option outside the home (like storage elsewhere); 3 = Balanced; 9 = Refused; 8 = Don't know
blq20IntegerRecommendedDid you find this web tool useful in helping you make a decision about changing firearm access?0;1;8;90 = No; 1 = Yes; 9 = Refused; 8 = Don't know/not sure
blq20bString250RecommendedIf you did not find the web tool useful in helping you make a decision about changing firearm access, then why?
blq21IntegerRecommendedDo you think the web tool included enough information to help a person decide on ways to change home access to firearms?0;1;8;90 = No; 1 = Yes; 9 = Refused; 8 = Don't know/not sure
blq21bString250RecommendedIf you do not think the web tool included enough information to help a person decide on ways to change home access to firearms, then why?
blq22IntegerRecommendedWas the web tool respectful of your and your family's values about guns?0;10 = No; 1 = Yes
blq22bString250RecommendedIf the web tool was not respectful of your and your family's values about guns, then why?
blq23IntegerRecommendedDid the web tool explain legal issues related to how guns are stored?0;1;8;90 = No; 1 = Yes; 9 = Refused; 8 = Don't know/not sure
blq23bString250RecommendedIf the web tool did not explain legal issues related to how guns are stored, then why?
blq24IntegerRecommendedDid the options presented feel realistic for your family - that is, something that you feel you might be able and willing to do?0;1;8;90 = No; 1 = Yes; 9 = Refused; 8 = Don't know/not sure
blq24bString250RecommendedIf the options presented did not feel realistic for your family, then why?
blq25IntegerRecommendedWould you recommend this tool to a friend or family member in a similar situation?0;1;8;90 = No; 1 = Yes; 9 = Refused; 8 = Don't know/not sure
blq25bString250RecommendedIf you would not recommend this tool to a friend or family member in a similar situation, then why?
blq26IntegerRecommendedWould you want the option to email web tool responses to yourself (rather than printing)?0;1;8;90 = No; 1 = Yes; 9 = Refused; 8 = Don't know/not sure
blq27String25RecommendedWhere, if anywhere, do you think this web tool could be useful?1 = Outpatient mental health clinics/settings; 2 = Emergency departments; 3 = On suicide prevention websites; 4 = On firearm websites (like the NRA or other gun education, retail, or advocacy groups); 4 = On other public websites; 5 = In settings for veterans/at the VA; 6 = In the military; 7 = None of the above; 9 = Refused; 8 = Don't know
pr_knowhop5String150RecommendedIs there anything else that you would like to tell us?blq28
blq_ff2IntegerRecommendedDo you live with the patient, even part of the time?0;1;90 = No; 1 = Yes; 9 = Refused
blq_ff4IntegerRecommendedIf you live with the patient (even part of the time), then are there firearms in the home where you and the patient live?0;1;8;90 = No; 1 = Yes; 9 = Refused; 8 = Don't know/not sure
blq_ff6e1IntegerRecommendedIf there is more than one gun stored in the patient's home, then how many guns are stored both unlocked and loaded?0::2;80 = None; 1 = One; 2 = More than one; 8 = Don't Know
visitString50RecommendedVisit name
fpq1IntegerRecommendedAt the end of your ER visit were you discharged home or admitted for mental health treatment?1;2;8;91 = Discharged; 2 = Admitted; 8 = Refused; 9 = Don't Know
fpq1bDateRecommendedIf, after ER visit, you were admitted for mental health treatment, what date were you discharged from the facility?
fpq1cString2,665RecommendedIf, after ER visit, you were admitted for mental health treatment, what is the name of the facility you were at?
fpq2IntegerRecommendedDuring your ER visit, do you remember being seen by a mental health consultant (like a social worker, psychologist, or behavioral health evaluator)?0;1;8;90 = No; 1 = Yes; 8 = Refused; 9 = Don't Know
fpq3IntegerRecommendedAt the time you came into the ER, were you already enrolled in some kind of outpatient mental healthcare (like with a therapist or psychiatrist)?0;1;8;90 = No; 1 = Yes; 8 = Refused; 9 = Don't Know
fpq4IntegerRecommendedSince your ER visit, have you seen an outpatient mental healthcare provider (like with a therapist or psychiatrist)?0;1;8;90 = No; 1 = Yes; 8 = Refused; 9 = Don't Know
fpq4bIntegerRecommendedSince your ER visit, if you have not seen an outpatient mental healthcare provider, are you planning to see one?0::2;8;90 = No; 1 = Yes, I have an appointment; 2 = Yes, but I don't have an appointment yet; 8 = Refused; 9 = Don't Know
fpq5IntegerRecommendedSince your ER visit, have you called the Colorado Crisis Hotline?0;1;8;90 = No; 1 = Yes; 8 = Refused; 9 = Don't Know
fpq5bIntegerRecommendedIf you have been in contact with the Colorado Crisis Hotline since your ER visit, did you call the hotline or did the hotline call you?1::3;8;91 = I called the hotline; 2 = The hotline called me; 3 = Both (I called and it called me); 8 = Refused; 9 = Don't Know
fpq13IntegerRecommendedSince your ER visit, have you (or your family) made any changes in how you store your guns?0;1;8;90 = No; 1 = Yes; 8 = Refused; 9 = Don't Know
fpq13bString20RecommendedSince your ER visit, if you (or your family) made any changes in how you store your guns, then what were they? Choose all that apply0 = Locking devices; 1 = Locking safes or gun lockboxes; 2 = Gave guns to a trusted family member for safekeeping; 3 = Gave guns to a trusted friend for safekeeping; 4 = Storing guns at a store or range that has firearm storage; 5 = Gave guns to a law enforcement agency that has firearm storage; 7 = Other
fpq13b_otherString665RecommendedSince your ER visit, if you (or your family) made any changes in how you store your guns, then what were they? Specify other method
fpq17aIntegerRecommendedConsidering the firearm storage option(s) you prefer, please answer the following questions: Do you know which options are available to you?0;2;40 = Yes; 2 = Unsure; 4 = Very Unsure
fpq17bIntegerRecommendedConsidering the firearm storage option(s) you prefer, please answer the following questions: Do you know the benefits of each option?0;2;40 = Yes; 2 = Unsure; 4 = Very Unsure
fpq17cIntegerRecommendedConsidering the firearm storage option(s) you prefer, please answer the following questions: Do you know the risks and side effects of each option?0;2;40 = Yes; 2 = Unsure; 4 = Very Unsure
fpq17dIntegerRecommendedConsidering the firearm storage option(s) you prefer, please answer the following questions: Are you clear about which benefits matter most to you?0;2;40 = Yes; 2 = Unsure; 4 = Very Unsure
fpq17eIntegerRecommendedConsidering the firearm storage option(s) you prefer, please answer the following questions: Are you clear about which risks and side effects matter most to you?0;2;40 = Yes; 2 = Unsure; 4 = Very Unsure
fpq17fIntegerRecommendedConsidering the firearm storage option(s) you prefer, please answer the following questions: Do you have enough support from others to make a choice?0;2;40 = Yes; 2 = Unsure; 4 = Very Unsure
fpq17gIntegerRecommendedConsidering the firearm storage option(s) you prefer, please answer the following questions: Are you choosing without pressure from others?0;2;40 = Yes; 2 = Unsure; 4 = Very Unsure
fpq17hIntegerRecommendedConsidering the firearm storage option(s) you prefer, please answer the following questions: Do you have enough advice to make a choice?0;2;40 = Yes; 2 = Unsure; 4 = Very Unsure
fpq17iIntegerRecommendedConsidering the firearm storage option(s) you prefer, please answer the following questions: Are you clear about the best choice for you?0;2;40 = Yes; 2 = Unsure; 4 = Very Unsure
fpq17jIntegerRecommendedConsidering the firearm storage option(s) you prefer, please answer the following questions: Do you feel sure about what to choose?0;2;40 = Yes; 2 = Unsure; 4 = Very Unsure
fpq18aIntegerRecommendedIn the next month, how likely is it that you will change the way you store medications at home?1::7;91 = Extremely likely; 7 = Extremely unlikely; 9 = I don't have any potentially toxic medications
fpq18bIntegerRecommendedIn the next month, how likely is it that you will change the way you store firearms at home?1::7; 91 = Extremely likely; 7 = Extremely unlikely; 9 = Not applicable (does not have firearms)
fpq19IntegerRecommendedDo you remember viewing general information about suicide prevention?0;1;8;90 = No; 1 = Yes; 8 = Refused; 9 = Don't Know
fpq19bIntegerRecommendedDo you remember viewing general information about suicide prevention? If yes, do you remember viewing information about firearm safety?0;1;8;90 = No; 1 = Yes; 8 = Refused; 9 = Don't Know
fpq20IntegerRecommendedDo you remember completing an educational tool about firearm storage?0;1;8;90 = No; 1 = Yes; 8 = Refused; 9 = Don't Know
fpq22IntegerRecommendedDid you have a family member or friend with you at any time during your ER visit?0;1;8;90 = No; 1 = Yes; 8 = Refused; 9 = Don't Know
fpq22bIntegerRecommendedIf you had a family member or friend with you at any time during your ER visit, did the ER providers include that person(s) in discussions about firearm storage?0::2;8;90 = No; 1 = Yes, family; 2 = Yes, friend; 8 = Refused; 9 = Don't Know
fpq22cIntegerRecommendedIf you did not have a family member or friend with you during your ER visit, do you wish there had been a friend or family member with you?0;1;8;90 = No; 1 = Yes; 8 = Refused; 9 = Don't Know
fpq23String665RecommendedIs there anything else you would like to tell me? Record final comments, verbatim, for follow-up to ER visit for suicide attempt
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: blq01 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.