Improving the diagnosis of memory decline
Single Wave Study
General Information
Title
Improving the diagnosis of memory decline
Project Number
431
Abstract
In this project, panel members were asked to perform a memory task. By
looking at all the different scores of panel members, the researchers can determine ‘normal’ scores.
This again helps to improve memory tests to assess memory issues.
Longitudinal Type
Single Wave Study
Begin date
04-08-2025
End date
30-09-2025
Topics
Researcher
Thomas Wilschut (University of Groningen)
Publisher
Centerdata
Copyright
© 2026 Centerdata
DOI
https://doi.org/10.57990/tqtj-j092
Funding Organization
ODISSEI
Datasets and documentation
View Documentation
Codebook in English
Codebook in Dutch
Data Files
English SPSS file
English STATA file
English CSV file
Variables
| Variable name | Variable Label |
|---|---|
| nomem_encr | Number of the household member encrypted |
| dah25a_m | Year and month of the field work period |
| dah25a001 | Explanatory video |
| dah25a002 | [data from task] Mean accuracy over all responses in the session |
| dah25a003 | [data from task] Standard deviation of the accuracy over all responses in the session |
| dah25a004 | [data from task] Mean reaction time over all responses in the session |
| dah25a005 | [data from task] Standard deviation of the reaction time over all responses in the session |
| dah25a006 | [data from task] Median reaction time over all responses in the session |
| dah25a007 | [data from task] Interquartile range of the reaction time over all responses in the session |
| dah25a008 | [data from task] Mean speed of forgetting over all items in the session |
| dah25a009 | [data from task] Standard deviation of the speed of forgetting over all items in the session |
| dah25a010 | [data from task] Sean SGMA index over all items in the session |
| dah25a011 | [data from task] Standard deviation of the SGMA index over all items in the session |
| dah25a012 | [data from task] Mean final speed of forgetting over all items in the session |
| dah25a013 | [data from task] Mean final SGMA index over all items in the session |
| dah25a014 | [data from task] Number of trials in the session |
| dah25a015 | [data from task] Number of unique items in the session |
| dah25a016 | [data from task] Which lesson was shown |
| dah25a017 | [data from task] Duration of the study session in minutes |
| dah25a018 | [data from task] Date of the session |
| dah25a019 | [data from task] Hour of the day when the session started |
| dah25a020 | [data from task] Minute of the hour when the session started |
| dah25a021 | [data from task] Indicates if a gap was detected in the session |
| dah25a022 | [data from task] Maximum duration of any gap detected in the session |
| dah25a023 | [data from task] Sequence for all seen items during the test session, in chronological order, separated by semicolon |
| dah25a024 | [data from task] Sequence of Unix timestamps in milliseconds for the start of each trial in the test session, in chronological order, separated by semicolon |
| dah25a025 | [data from task] Sequence for accuracy of all trials during the test session, in chronological order, separated by semicolon |
| dah25a026 | [data from task] Sequence for response times in milliseconds of all trials during the test session, in chronological order, separated by semicolon |
| dah25a027 | [data from task] Sequence for the chosen answers for trials during the test session, in chronological order, separated by semicolon |
| dah25a028 | [data from task] Sequence for the presented alternative answers for trials during the test session, in chronological order, separated by semicolon |
| dah25a029 | Did you manage to complete the memory test in one go? |
| dah25a030 | Did you manage to complete the memory test in one go? No, I had other issues, namely: [text] |
| dah25a031 | Have you been diagnosed as having one or more of the following learning or reading disorders? Dyslexia (reading disorder) |
| dah25a032 | Have you been diagnosed as having one or more of the following learning or reading disorders? Dyspraxia (developmental coordination disorder) |
| dah25a033 | Have you been diagnosed as having one or more of the following learning or reading disorders? Dyscalculia (arithmetic disorder) |
| dah25a034 | Have you been diagnosed as having one or more of the following learning or reading disorders? Attention disorder (ADD or ADHD) |
| dah25a035 | Have you been diagnosed as having one or more of the following learning or reading disorders? Autism or another disorder affecting speech, language or communication |
| dah25a036 | Have you been diagnosed as having one or more of the following learning or reading disorders? Other |
| dah25a037 | Have you been diagnosed as having one or more of the following learning or reading disorders? I would rather not say |
| dah25a038 | Have you been diagnosed as having one or more of the following learning or reading disorders? None of the reading or learning disorders listed above apply to me |
| dah25a039 | Have you been diagnosed as having one or more of the following learning or reading disorders? Other, namely: [text] |
| dah25a040 | How would you personally rate your memory? |
| dah25a041 | Was it difficult to answer the questions? |
| dah25a042 | Were the questions sufficiently clear? |
| dah25a043 | Did the questionnaire get you thinking about things? |
| dah25a044 | Was it an interesting subject? |
| dah25a045 | Did you enjoy answering the questions? |
| dah25a046 | Starting date questionnaire |
| dah25a047 | Starting time questionnaire |
| dah25a048 | End date questionnaire |
| dah25a049 | End time questionnaire |
| dah25a050 | Duration in seconds |
Response Information
Response Overview
Selected number of household members: 3,255 (100.0%)Non-response: 1,158 (35.6%)
Response: 2,097 (64.4%)
Complete: 2,051 (63.0%)
Incomplete: 46 (1.4%)
Collection Events
Period
04-08-2025 to 26-08-2025
Sample
A random sample of panel members, stratified on age, gender and education level.
Collection Mode
Internet Survey
Fieldwork Note
A reminder was sent twice to non-respondents.
Period
01-09-2025 to 30-09-2025
Sample
Non-respondents of the first measurement.
Collection Mode
Internet Survey
Fieldwork Note
A reminder was sent twice to non-respondents.