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Description
Value Range
Notes
Data Structures with shared data
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Alzheimer's Disease Assessment Scale Cognitive Subscale

adas_cog

01

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Element NameData TypeSizeRequiredDescriptionValue RangeNotesAliases
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*
src_subject_idString20RequiredSubject ID how it's defined in lab/projectcatieid
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging 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
adas01aIntegerRecommendedWorld Recall Trial 10::10number of errors
adas01bIntegerRecommendedWorld Recall Trial 20::10number of errors
adas01cIntegerRecommendedWorld Recall Trial 30::10number of errors
adas02IntegerRecommendedNaming Objects0::50 = 0-2 items, 1 = 3-5 items, 2 = 6-8 items, 3 = 9-11 items, 4 = 12-14 items, 5 = 15-17 items
adas03IntegerRecommendedCommands Score0::51 = 1 command incorrect / 4 commands correct 2 = 2 commands incorrect / 3 commands correct 3 = 3 commands incorrect / 2 commands correct 4 = 4 commands incorrect / 1 command correct 5 = all 5 commands incorrect
adas04IntegerRecommendedConstructional Praxis Score0::50 = all 4 drawn correctly 1 = 1 form drawn incorrectly 2 = 2 forms drawn incorrectly 3 = 3 forms drawn incorrectly 4 = 4 forms drawn incorrectly 5 = no figures, scribbles; parts of forms; words
adas05IntegerRecommendedIdeational Praxis Score0::50 = all components performed correctly 1 = failure to perform 1 component 2 = failure to perform 2 components 3 = failure to perform 3 components 4 = failure to perform 4 components 5 = failure to perform 5 components
adas06IntegerRecommendedOrientation Score0::8Number of incorrect responses
adas07aIntegerRecommendedWorld Recognition Trial 10::12number of errors
adas07bIntegerRecommendedWorld Recognition Trial 20::12number of errors
adas07cIntegerRecommendedWorld Recognition Trial 30::12number of errors
adas08IntegerRecommendedRemembering Test Instructions0::50 = patient never needs reminders of instructions 1 = very mild � forgets once 2 = mild � must be reminded 2 times 3 = moderate � must be reminded 3 or 4 times 4 = moderately severe � must be reminded 5 or 6 times 5 = severe � must be reminded 7 or more times
adas09IntegerRecommendedSpoken Language Ability0::50 = no instances where it is difficult to understand patient 1 = very mild � one instance of lack of understandability 2 = mild � patient has difficulty less than 25% of the time 3 = moderate � patient has difficulty less than 25-50% of the time 4 = moderately severe � patient has difficulty less than 50% of the time 5 = severe � one or two word utterance; fluent, but empty speech; mute
adas10IntegerRecommendedWord-Finding Difficulty in Spontaneo0::50 = no evidence of word finding difficulty in spontaneous speech 1 = very mild � 1 or 2 instances, not clinically significant 2 = mild � noticeable circumlocution or synonym substitution 3 = moderate � loss of words without compensation on occasion 4 = moderately severe � frequent loss of words without compensation 5 = severe � nearly total loss of content of words; speech sounds empty; 1-2 word utterances
adas11IntegerRecommendedComprehension of Spoken Language0::50 = no evidence of poor comprehension 1 = very mild � 1 or 2 instances of misunderstanding 2 = mild � 3-5 instances of misunderstanding 3 = moderate � requires several repetitions and rephrasing 4 = moderately severe � patient only occasionally responds correctly; i.e., yes/no 5 = severe � patient rarely responds to questions appropriately, not due to poverty of speech
adas12IntegerRecommendedConcentration/ Distractibility0::100 = none, no evidence of poor concentration or distractibility 1 = very mild, one instance of poor concentration 2 = mild, 2-3 instances of poor concentration/distractibility; signs of restlessness and inattentiveness 3 = moderate, 4-5 instances during interview 4 = moderately severe, poor concentration/distractibility throughout much of interview 5 = severe, extreme difficulty in concentration and extremely distractible, unable to complete tasks; 6 = Is goal-oriented, can maintain interest in tasks; 7 = Slightly distractible, but is goal-oriented and can finish tasks with minimal pressure; 8 = Quite distractible; finishes tasks only with considerable pressure; shows minimal goal-oriented behavior; 9 = Extremely distractible, cannot sustain attention for more than a few seconds, regardless of external pressure; 10 = Never starts or gets involved in anything presented to him and therefore cannot be rated.
adas13IntegerRecommendedNumber Cancellation:0::40number of targets hit
adas14IntegerRecommendedExecutive Function(maze)0::240in seconds
adas_tsFloatRecommendedADAS Total Score0::5000Created variable with 20% missing data rule applied: First, we created 2 intermediate variables: M_RECALL (mean number of words not recalled in the 3 trials): Average of (10-ADAS01A), (10-ADAS01B), (10- ADAS01C). M_RECOG (mean number of words not recognized in the 3 trials): Average of ADAS07A, ADAS07B, ADAS07C. Total score is calculated as follows: Sum of M_RECALL, ADAS02, ADAS03, ADAS04, ADAS05, ADAS06, M_RECOG, ADAS08, ADAS09, ADAS10, ADAS11
visitidIntegerRecommendedMetaTrial Visit IDSystem variable: unique code for each type of visit -use to merge files
visitString50RecommendedVisit nameCharacter description of each type of visit
visnumFloatRecommendedNumeric Visit Number-1.5 = Pre-Screening; -1 = Screening; 0 = Baseline; ## = Visit ## (from 1 to 10); Whole numbers = standard monthly visits; #.001 - #.009 = Unscheduled; #.1 = End of Phase 1; #.2 = End of Phase 2; #.3 = End of Phase 3; #.4 = End of Open Choice Phase; #.5 = End of Study; #.6 = Genetic Analysis; 1000=all visits
phase_ctString20RecommendedCurrent Phase. Phase patient was in at the time of the assessment Phase 4 refers to the follow-up phase.Pre-Rand; Phase 1/1A; Phase 2; Phase 3; Phase 4; Phase 1B; Open-Choice Phase; Screening; Phase 1
last1IntegerRecommendedFlag Last Phase 1/1A Visit1=Yes for all records meeting this criteria
base1IntegerRecommendedFlag Baseline Phase 1/1A Visit1=Yes for all records meeting this criteria
base_tsFloatRecommendedBaseline Total ScoreScare at Phase 1 baselline
c_tsFloatRecommendedChanged from Baseline ADAS Total ScoreChange from Phase 1 baseline
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
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  • 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)
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Distribution for DataStructure: adas_cog01 and Element:
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