Data dictionary change impact
=============================

StatMedAnalysis | Original downloadable worksheet | 6 November 2026

Trace a definition change to affected collection and analysis code.

How to use this worksheet
Compare the old and new variable definitions field by field. Classify changes to
meaning, unit, allowed values or missing codes. Identify existing records and scripts
that rely on the old definition. Test a controlled migration and record whether
historical and new data remain comparable.

Save a working copy and keep the original blank version. Use public, hypothetical or
aggregate information only; do not enter patient identifiers, credentials or confidential
records. Keep source evidence in your approved project workspace. Mark unresolved text
fields UNKNOWN or NOT REPORTED with a reason; never substitute zero for an unknown count.

Project/version __________________  Prepared by role/date __________________

Working fields
1. Variable and old definition
Response/evidence: _________________________________________________________
___________________________________________________________________________

2. New definition and effective date
Response/evidence: _________________________________________________________
___________________________________________________________________________

3. Semantic versus formatting change
Response/evidence: _________________________________________________________
___________________________________________________________________________

4. Affected data periods
Response/evidence: _________________________________________________________
___________________________________________________________________________

5. Dependent forms and scripts
Response/evidence: _________________________________________________________
___________________________________________________________________________

6. Migration rule and synthetic test
Response/evidence: _________________________________________________________
___________________________________________________________________________

7. Comparability or discontinuity
Response/evidence: _________________________________________________________
___________________________________________________________________________

8. Approval and version linkage
Response/evidence: _________________________________________________________
___________________________________________________________________________

Hypothetical worked case
A fictional variable changes from completed years to months while keeping its name.
Existing thresholds and table labels become incorrect unless code and documentation are
migrated together.

Decision rule and limitations
Do not merge versions with different meanings without an explicit harmonization rule.
Retain original definitions and identify observations that cannot be made comparable.

Decision _______________________  Remaining uncertainty ____________________
Next action ____________________  Owner / review date ______________________
Independent check and discrepancy resolution _______________________________

Official method or reporting reference checked 6 November 2026
https://ukdataservice.ac.uk/learning-hub/research-data-management/

This is an original planning aid, not an official checklist, validated instrument,
clinical recommendation or certificate of expert approval. Apply the referenced
guidance to the specific design and record any additional requirements.