Study Permissions Dataset#
Last modified: 28 Nov 2025
1. Summary#
The study permissions dataset, formerly know as the denominator dataset, incorporates all participants across all LPS. Each project in the TRE is automatically provisioned a file named ‘study_permissions_v0000_YYYYMMDD’ (formerly known as ‘CORE_denominator_file1_v0000_YYYYMMDD’). The date in the dataset name relates to the “File 1” freeze (permissions) to which each project is fixed. Participant permissions are correct and applied to each dataset as of this date.
The dataset enables researchers to:
calculate linkage rates (when joined to linked datasets)
contextualise LPS participants within UK LLC in relation to the LPS datasets.
When considering NHS England and Wales linkage permission flags (nhs_e_linkage_permission and nhs_w_linkage_permission), you need to also consider the national_opt_out flag. When national_opt_out is set to “0”, this means that the participant has set explicit consent with their LPS. Where national_opt_out is set to “1”, this means that the participant has flowed for linkage under Section 251 support. Participants who flow under Section 251 are filtered by linked data owners for national data opt-outs (NDOOs)- the health records of any section 251 participant who has set an NDOO will not flow to UK LLC. Note, however, that exclusion of participants whose national_opt_out flag is set to “1”, cannot be inferred to mean that they had set an NDOO. NHS data owners do not notify UK LLC of which participants have set NDOOs and there are other reasons for participants’ health data not flowing, such as failed linkage due to quality of personal identifiers.
| Dataset Descriptor | Dataset-specific Information |
|---|---|
| Name of Dataset in TRE | UKLLC_study_permissions |
| Citation (APA) | UK Longitudinal Linkage Collaboration. (2025). UK LLC Managed: Study Permissions Dataset - Dated 03 Sep 2025. UK Longitudinal Linkage Collaboration (UK LLC). https://doi.org/10.71760/ukllc-dataset-00479-01 |
| Download Citation | Citeproc JSON BibTeX RIS |
| Series | UK LLC Managed |
| Owner | UK Longitudinal Linkage Collaboration |
| Temporal Coverage | Unknown - Unknown |
| Keywords | |
| Participant Count | 332157 |
| Number of variables | 15 |
| Number of observations | 819155 |
| Specific Restrictions to Data Use | None |
| Build a Data Request | https://explore.ukllc.ac.uk/ |
2. Variables#
| Variable | Description |
|---|---|
| study_id_e | None |
| cohort | Longitudinal Population Study participant belongs to |
| ukllc_status | Overall UK LLC permission |
| nhs_e_linkage_permission | Permission to link to NHS England records |
| nhs_ni_linkage_permission | Permission to link to NHS records in Northern Ireland |
| nhs_s_linkage_permission | Permission to link to Scottish NHS records |
| nhs_w_linkage_permission | Permission to link to Welsh NHS records |
| geocoding_permission | Permission to geocode and link to records with postcode/UPRN |
| zoesymptomtracker_permission | Permission to link to Zoe Sympton Tracker data |
| national_opt_out | LPS is using opt-out and opt-out to be applied to participant |
| avail_from_dt | None |
| llc_join_date | Date participant join UK LLC |
| hmrc_linkage_permission | None |
| dwp_linkage_permission | None |
| dfe_linkage_permission | None |
3. Version History#
TBC
4. Useful Syntax#
Below we will include syntax that may be helpful to other researchers in the UK LLC TRE. For longer scripts, we will include a snippet of the code plus a link to Git where you can find the full scripts.