NDA Help Center

Login Dialog

Frequently Asked Questions


NDA Help Center

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



Reset Password

NDA provides a single access to de-identified autism research data. For permission to download data, you will need an NDA account with approved access to NDA or a connected repository (AGRE, IAN, or the ATP). For NDA 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.

Update Password

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:

  • Uppercase
  • Lowercase
  • Numbers
  • Special Characters limited to: %,_,!,@,#,$,-,%,&,+,=,),(,*,^,:,;

Subscribe to our mailing list

Mailing List(s)
Email Format

You are now leaving the NIMH Data Archive (NDA) web site to go to:

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


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

Accept Terms
Filter Cart
No filters selected
Value Range
Data Structures with shared data
No filters have been selected
Switch User

Delusion Assessment Scale



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/projectsubjid
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 subjectM;FM = Male; F = Femalegender
rodsIntegerRecommendedRESOLUTION OF DELUSIONS1::51 = Delusional belief is not present currently. Patient is able to recognize that the delusional belief present earlier in the episode was false and/or was a result of a mental illness. (Skip out; no need to administer remainder of DAS.);2 = Delusional belief is not present currently. Patient is able to recognize that the delusional belief present earlier in the episode may have been false and/or may have been the result of a mental illness. (Administer entire scale based on partially resolved delusion.);3 = Delusional belief is not present currently. Patient has near certainty that the delusional belief present earlier in the episode was true; any doubts are only transient. (Administer entire scale based on partially resolved delusion.) 4 = Delusional belief is not present currently. Patient has unwavering conviction that the delusional belief present earlier in the episode was true. (Administer entire scale based on partially resolved delusion.) 5 = Delusional belief is present currently. (Complete entire scale.)
das_1IntegerRecommendedA. CONVICTION: I. Subjective Feeling Of Certainty (rated based on self-report as expressed during interview)1::31 = Ability to offer doubt about belief (e.g., acknowledgement that belief could be the result of an illness) although unwilling to fully dismiss belief as inaccurate);2 = Near certainty the belief is true; any doubts are only transient;3 = Absolute and unwavering convictiondas1
das_2IntegerRecommendedA. CONVICTION: II. Acting On The Belief (rated using historical information and explanation of previous behavior to interviewer; also assesses whether judgment is affected by belief)1::31 = Belief does not influence actions;2 = Acts or has acted on the belief, but such actions do not have significant consequences such as impairing functioning and or affecting others (e.g., acting suspiciously towards hospital staff; changing locks on doors, repeated visits to physicians because of a somatic preoccupation, complaining to police about neighbors);3 = Actions demonstrate markedly impaired judgment; actions have a significant impact on the patient's life with adverse consequences to the patient or others (e;g;, acts that directly resulted in hospitalization, such as refusing to eat or making a suicide attempt)das2
das_3IntegerRecommendedA. CONVICTION: III. Acting Irrationally Towards Interviewer (rated based on interviewer's observations, including responses to attempts to clarify and to confrontation)1::31 = Not distrustful towards interviewer;2 = Distrustful as in questioning motives of interviewer (e;g;, refusal to provide clinician with any personal information or asking to be discharged without treatment because no illness is present;3 = Refusal to answer even the simplest personal questions or is mutedas3
das_4IntegerRecommendedA. CONVICTION: IV. Accommodation (observer's assessment of responses to confrontation and reality testing by interviewer, in contrast to item I which assesses subjective level of conviction)1::31 = Confrontation leads to modification of belief;2 = Confrontation leads to consideration of alternative explanations or modification of some aspects of the belief, but central belief is unchanged;3 = Confrontation has no effect on the belief and does not lead to consideration of alternative explanationsdas4
das_5IntegerRecommendedB. EXTENSION: V. People And Objects Involved1::31 = The number of objects involved is discrete (e.g., diseased organ(s) in the case of somatic delusions, organizations and their employees, e.g., FBI, next door neighbors, a specific doctor's staff or a specific phone is tapped);2 = The number of people or organizations involved cannot be defined clearly but appears to be limited by identifiable characteristics and can be organized around a central theme (e.g. belief colleagues at work are conspiring against the individual and may have enlisted others);3 = Rater is unable to obtain a clear and complete description of the delusion; there are no defining characteristics that limit the number of individuals or organizations involved in the belief; For somatic delusions the organs or diseases that are the focus of the concerns cannot be identifieddas5
das_6IntegerRecommendedB. EXTENSION: VI. Places/Situations In Which The Delusional Idea Is Prominent1::31 = Delusional ideation is limited to a single context/place (e.g., work/home/ traveling in a subway); Paranoia is limited to home or work but does not involve hospital; Because the patient brings his/her physical self into different settings, a circumscribed somatic delusion is rated as 1;2 = The delusional ideas occur in multiple contexts or places that have common identifiable characteristics (e;g;, the neighborhood, hospital and other locations consistent with a specific delusional theme such as persecution based on ethnicity);3 = There are no defining characteristics that limit places/situations that may be involved in the beliefsdas6
das_7IntegerRecommendedC. BIZARRENESS: VII. Distortion Of Consensual Reality (Implausibility)1::31 = May be considered an extreme value judgment or remote possibility but is not patently absurd because of physical impossibility (e.g., somatic delusion of having a cancer or paranoid delusion of being followed);2 = Content of belief is obviously implausible but is not physically impossible (e.g., somatic delusion of having been poisoned by persecutor, of being the victim of conspiracy by coworkers to cause termination of employment, or a paranoid delusion that a neighbor is tapping the telephone or has hacked into the patient's computer);3 = Belief is patently absurd and physically impossible (e;g;, delusions of thoughts being withdrawn or inserted electronically or being monitored by satellite)das7
das_8IntegerRecommendedC. BIZARRENESS: VIII. Relationship To Cultural Context1::31 = Belief is consistent with patient's cultural background and could be seen as plausible by individuals of the same background (e;g;, conviction of persecution that is based on race or gender);2 = Although members of the culture would not accept the belief as plausible, the belief is directly related to the cultural context (e;g;, patient believes he has been singled out for persecution to set an example for all members of his race/religion or because of being chosen for a special mission by God);3 = Belief is entirely deviant from those held by members of patient's culture; (e;g;, belief that one has been chosen to colonize space for his race)das8
das_9IntegerRecommendedD. DISORGANIZATION: IX. Internal Consistency (ratings based upon interview)1::31 = Single or multiple beliefs are clearly connected to the principal delusional idea or a single theme (e.g., guilty, hopeless and deserves to be punished because of a long-past sexual indiscretion);2 = Multiple delusional ideas are present that are related to a central theme; However, the ideas involve more than one false assumption and are not clearly connected (e.g., patient will be punished by Internal Revenue Service for taking an extra tax exemption 20 years ago and neighbors are now spying and monitoring behavior for the police);3 = Multiple delusional ideas that cannot be connected to a single theme (e;g;, delusions of being persecuted without apparent reason, of having sexual organs removed and of receiving telepathic messages)das9
das_10IntegerRecommendedD. DISORGANIZATION: X. Cognitive Integration (rated based upon interview)1::31 = Patient can explain how multiple delusional ideas are connected to a single primary belief or has a single delusion that tells a cohesive story;2 = There are multiple parts to a single delusional idea, or multiple delusional ideas, that the patient attempts to integrate but cannot explain cohesively how multiple ideas are connected;3 = Patient recognizes the lack of relationship of multiple delusional ideas with a single theme or a principal belief, and either cannot or will not provide an explanationdas10
das_11IntegerRecommendedD. DISORGANIZATION: XI. Temporal Continuity of the Most Prominent Delusion(s) (Rated using historical information but based on assessment during interview)1::31 = The same delusional idea or ideas has/have been held consistently during an episode of illness without the addition of new ideas;2 = During the current episode or the interview, there has been one consistently held prominent delusional idea, but some modification has occurred or another delusion has developed; Additional transient ideas may have developed or resolved;3 = The content of the most prominent delusion has changed significantly during the episode of illness or has been replaced by a different delusion (e.g., a fear of being followed in the neighborhood has become a fear of being poisoned by another patient)das11
das_12IntegerRecommendedE. PRESSURE: XII. Temporal Pressure (rated using observations, including those of others)1::31 = Most of the day is spent without being concerned about the belief;2 = Preoccupied with the belief enough of the day to interfere with the completion of tasks such as routine chores or work;3 = Preoccupation with the belief is nearly constant and interferes with completion of all or nearly all simple responsibilitiesdas12
das_13IntegerRecommendedE. PRESSURE: XIII. Temporal Pressure During Interview (rated based on interview)1::31 = Thoughts of the belief do not intrude during the interview and engagement in extended discussion of other topics is possible;2 = The belief or related ideas intrude into the interview, but distraction to other topics is possible;3 = The belief or related thoughts repeatedly interrupt the interview and engagement in discussion of other topics for more than a few moments or sentences is not feasibledas13
das_14IntegerRecommendedE. PRESSURE: XIV. Emotional Pressure (rated primarily through interview but can incorporate observations of others)1::31 = Belief does not cause obvious affective distress or concern;2 = Discussion of belief causes subjective or objective emotional distress (e;g;, anxiety or depression);3 = Discussion of belief causes marked distress leading to intense expressions of affect (e;g;, pronounced fear, overt crying or fearfulness)das14
das_16IntegerRecommendedE. PRESSURE: XV. CONGRUENCE Rate the most prominent delusion only. Extent to which delusional belief is consistent with the disturbance of mood1::31 = There is no relationship between delusional belief and a mood disturbance (e;g;, a paranoid delusional in which the patient believes persecution is unjust and is not due to a personal misdeed or negative attribute);2 = The delusional belief is consistent with the theme of the mood disturbance through an identified personal failing on the part of the patient, but the connection is tenuous (paranoid delusion about conspiracy to terminate job because performance has been impaired during depression; paranoid delusion that children are stealing money because patient has been unavailable to grandchildren);3 = Delusions of guilt, hopeless or nihilism; somatic delusions (by convention); paranoid delusion in which persecution is attributed to a real or imagined personal misdeed; belief that current depression is untreatable and that patient will require life-long state hospitalizationdas16
das_impactIntegerRecommendedImpact factorSum of Items 2,3,12,13,14 - not scored if any are missing
das_disorgIntegerRecommendedDisorganization factorSum of Items 9,10,11 - not scored if any are missing
das_convictIntegerRecommendedConviction factorSum of Items 1,4 - not scored if any are missing
das_bizzareIntegerRecommendedBizarreness factorSum of Items 7,8 - not scored if any are missing
das_extensionIntegerRecommendedExtension factorSum of Items 5,6 - not scored if any are missing
siteString101RecommendedSiteStudy Site
weekFloatRecommendedWeek in level/study99=week 10-week 14intid
study_idIntegerRecommendedStudy ID number46=Acute Phase; 47=Stabilization Phase
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: del01 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.