Versions of the TEDS Data Dictionary
This table shows the versions of this web, in date order, from the first version down to the current version. The table columns are the version number, the date when the system was updated with each new version, and the new pages or sections that were added.
| Version number | Date | Additions to system |
|---|---|---|
| 1.0 | March 2007 | 1st Contact study: plain and annotated booklets, returns, processing stages, derived variables, variable list. |
| 1.1 | April 2007 | 1st Contact study: coding manuals, cleaning the data, verbatim text, data files. |
| 1.2 | 9 May 2007 | 2 Year booklet study pages. |
| 1.3 | 23 May 2007 | 3 Year booklet study pages. |
| 1.4 | 8 June 2007 | 4 Year booklet study pages. This versions page. |
| 1.5 | 22 June 2007 | Combined (1/2/3/4) booklet dataset. |
| 1.6 | 07 September 2007 (first main release version) |
In Home study pages. All pages restructured to include related links down the left hand side. |
| 1.6.1 | 26 September 2007 | Derived variables pages restructured, with links at top of page grouped by subject/topic (instead of alphabetical list) |
| 1.6.2 | 28 September 2007 | Revisions to Home page and 1st Contact main page. |
| 1.6.3 | 1 October 2007 | Measures pages. |
| 1.7.1 | 19 October 2007 | Pdf documents for 7 Year Study. |
| 1.7.2 | 19 December 2007 | 7 Year Study pages. |
| 1.8 | 11 February 2008 | 8 Year Study pages. |
| 1.9 | 10 March 2008 | 9 Year Study pages. |
| 1.9.1 | 9 June 2008 | Addition of an Introduction
section to each main study page. Modification of the 7/8/9yr data cleaning page to incorporate data cleaning for all questionnaire data from 7yr onwards. |
| 1.10 | 20 June 2008 | 10 Year Study pages. |
| 1.11 | 17 September 2008 | 12 and 14 Year initial pages: main page, measures, booklet pdfs, and 12yr returns. |
| 1.12 | 6 October 2008 | 12 and 14 Year additions: pages describing each of the web tests |
| 1.12.1 | 10 November 2008 | 12 and 14 Year additions: web testing summaries, and annotated pdf documents showing item coding. |
| 1.12.2 | 28 November 2008 | 12 Year Study pages
completed (additions: list of variables, derived variables, data files,
data processing). 14 Year addition: derived variables page (work in progress). General addition: summary page for data files. |
| 1.14 | 18 May 2009 | 14 Year Study pages brought up to
date, pending collection of further data and addition of scales to the
dataset. General additions: summary pages for data entry, data cleaning, and data processing. |
| 1.14.1 | 9 September 2009 | 14 Year Study pages brought
up to date, incorporating plans to contact cohorts 2, 3 and 4. General additions: summary pages for measures, and for booklet/questionnaire pdfs. |
| 1.14.2 | 23 September 2009 | General additions: summary pages for study samples and data returns, and a glossary. |
| 1.14.3 | 24 September 2010 |
14 Year Study pages brought up to date, including descriptions of wave
2 data collection. General addition: summary pages for spin-off studies, and for data files. |
| 1.16.1 | 21 March 2011 | 16 Year Study initial pages:
main page, measures, initial returns, web study activity pages, GCSE
questionnaire, behaviour study questionnaires. Numerous code errors corrected. Returns pages modified from 7 Year and later studies, to show returns by study cohort rather than by twin birth year. |
| 1.16.2 | 18 July 2011 | Further 16 Year Study pages:
list of variables, derived variables, data files, processing stages,
data cleaning. Refinement and updating of earlier 16 Year pages. Updates to general pages, to add references to the 16 Year study and links to the 16 Year pages. |
| 1.16.3 | 19 October 2011 | Refinement and updating of
earlier 16 Year pages, particularly with reference to new variables for
GCSE/exam results. New 16 Year Study page: exam results collection page. New general page describing TEDS DNA collection studies. |
| 1.16.4 | 4 April 2012 | Refinement and updating of
earlier 16 Year pages, particularly with reference to the LEAP booklet
study (with new pdfs). |
| 1.18.1 | 14 September 2012 | Addition of 18 Year study
pages (many of them in an incomplete state). Updating of existing 16 Year pages with reference to the new LEAP-2 booklet study. |
| 1.18.2 | 11 March 2013 | Updates to 18 Year study pages. Updates to 1st Contact and 2 Year study pages, to reflect changes in the new versions of the 1st Contact and 2 Year datasets. |
| 1.18.3 | 13 January 2014 |
Updates to 3 Year and 4 Year study pages, to reflect changes in the new
version of the 3 Year and 4 Year datasets. Removal of the Combined Booklet Dataset pages (this dataset is now redundant). Modification of pages describing the zygosity algorithm and scrambling of IDs. Minor updates to 16 Year and 18 Year study pages |
| 1.18.4 | 14 April 2014 | Addition of the Perception Study to the 18 Year Study pages. Addition of page describing representativeness of study samples. Addition of documents to the spin-off studies page. Updates to 7 Year study pages reflecting changes to the dataset. |
| 1.18.4.1 | 7 May 2014 | Updates to 8 and 9 Year study pages reflecting changes to the dataset. |
| 1.18.4.2 | 18 June 2014 | Updates to 10 Year study pages reflecting changes to the dataset. |
| 1.18.4.3 | 1 October 2014 | Updates to 12 Year study pages reflecting changes to the dataset. |
| 1.18.5 | 4 June 2015 | Updates to 18 Year study pages, including addition of the Bricks and FFMP web studies. |
| 1.18.5.1 | 23 September 2015 | Updates to 18 Year study pages, including addition of the Kings Challenge web study. |
| 1.18.5.2 | 2 December 2015 | Addition of web data cleaning page, and numerous minor revisions to other pages. |
| 1.18.5.3 | 18 January 2016 | Updates to 18 Year returns. Updates to 16 Year study pages reflecting changes to the dataset. |
| 1.18.6 | 3 January 2017 |
Updates to In Home study pages reflecting changes to the dataset. Expansion of detail in the 'sample selection' part of the 1st Contact page. Minor updates to various 18 Year pages. |
| 1.21 | 18 September 2017 | Initial pages added for the TEDS 21 study. |
| 1.21.1 | 16 July 2018 | More details added for the TEDS 21 study, including the phase 2 questionnaire. |
| 1.21.2 | 17 December 2018 | New "exclusions" page, and new versions of exclusion variables. Minor updates for the TEDS 21 study. |
| 1.21.3 | 18 January 2019 | New version of longitudinal "measures" page. Minor updates for the TEDS 21 study. |
| 1.21.4 | 9 August 2019 | New "polygenic scores" page. |
| 1.21.5 | 15 January 2020 | New page describing "background variables"; standardisation of all
background variables across different datasets. Additions to 21 Year study derived variables and measures pages. |
| 1.21.6 | 25 August 2020 | New pages describing the g-game and covid studies (phases 1 and 2)
incorporated within the 21 Year section, with associated updates to
the 21 Year study derived variables and measures pages. Modified, adaptive layout introduced in most pages to improve formatting when viewed on mobile devices. |
| 1.21.7 | 6 November 2020 | Updates to 21 Year section to incorporate details of covid study phase 3. |
| 1.21.8 | 6 April 2021 | Updates to 21 Year section to incorporate details of covid study phase 4. |
| 1.21.9 | 12 May 2022 | Updates reflecting modifications to the datasets for ages 7 to 21. |
| 1.26 | 7 June 2023 | Initial pages added for the 26 Year study
(TEDS26 and CATSLife). Addition of new page outlining pilot studies. |
| 1.26.1 | 10 October 2023 | Updates reflecting modifications to the
datasets for ages 2, 3 and 4. Updates to anxiety scales across various ages. |
| 1.26.2 | 11 June 2024 |
Addition of a page describing linked NHS datasets in the LLC. Updates to 26 Year study pages, following completion of the CATSLife study. Updates reflecting modifications to the 1st Contact datasets. Updates to parental feelings and discipline scales across various ages. |