TPP

ehrql.backends.tpp.TPPBackend

TPP are the developers and operators of the
SystmOne EHR platform. The ehrQL TPP backend
provides access to primary care data from SystmOne, plus data linked from other
sources.

Patients included in the TPP backend

SystmOne is a primary care clinical information system
used by roughly one third of GP practices in England,
with records for approximately 44% of the English population.

Only patients with a full GMS (General Medical Services) registration are included.

We have registration history for:

• all patients currently registered at a TPP practice
• all patients registered at a TPP practice any time from 1 Jan 2009 onwards:
  • who have since de-registered
  • who have since died

A patient can be registered with zero, one, or more than one practices at a given
time. For instance, students are often registered with a practice at home and a
practice at university.

!!! warning
Refer to the discussion of selecting populations for studies.

This backend implements the following table schemas:

• core
• raw.core
• tpp
• raw.tpp
• smoketest

EMIS

ehrql.backends.emis.EMISBackend

!!! warning
Research access to the backend provided by EMIS is temporarily unavailable,
pending funding arrangements between NHS England and EMIS.
When funding has been secured,
we will publish a timeline for gradually reopening access.

EMIS Health are the developers and operators of the
EMIS Web EHR platform. The ehrQL
EMIS backend provides access to primary care data from EMIS Web, plus data linked
from other sources.

This backend implements the following table schemas:

• core
• raw.core
• raw.emis
• emis
• smoketest