NHS performance analysis

Reviewed by PlainNHS ·

How to read NHS performance data

The English NHS publishes more detailed operational performance data than any other comparable healthcare system — the monthly RTT release, the A&E waiting-times publication, and the cancer waiting-times statistics combine to give a granular view of how every Trust is performing against published operational standards.

Interpreting these figures correctly requires three understandings: the standard itself (what does “18-week RTT” actually measure?), the contextual factors that drive variation (case-mix, bed availability, workforce, elective recovery investment), and the difference between operational measures (process) and clinical-outcome measures (impact).

Recent patterns in the data

Since the early-2020s elective backlog, RTT 18-week performance has sat well below the operational standard of 92%. The mean across English Trusts has hovered in the 70-80% range, with meaningful regional variation: London and the South East typically out-perform the North-East and Midlands, but the within-region spread is larger than the between-region spread — meaning the choice of Trust within your region usually matters more than the choice of region.

A&E 4-hour performance has been more responsive to seasonal pressures than to long-term improvement initiatives. The all-types figure (combining major emergency departments, single-specialty units, and minor injury units) typically sits 5-10 percentage points above the major-only figure; both have been below the 95% standard for several years.

Cancer 62-day performance has been the most pressured of the three headline standards. The Faster Diagnosis Standard (28-day) introduced in 2021 was a response to consistent under-performance on the 62-day target.

What does this mean for patients?

When weighing a referral choice, three signals matter:

  1. CQC inspection rating — an independent overall quality judgment. See our CQC guide.
  2. Procedure-specific median wait — the most direct predictor of how long you will personally wait. See the procedure index.
  3. Operational performance against the relevant standard — what proportion of patients on this pathway are being treated within the operational target?

The comparison tool places any two Trusts side by side on all three signals plus procedure-specific waits.

Limitations of operational performance data

Three caveats to bear in mind when reading NHS performance figures:

  • Process not outcome. RTT and A&E figures measure how long patients wait, not what happens to them clinically. A Trust with poor 18-week performance can deliver excellent clinical outcomes; a Trust with strong RTT performance can have an unrelated weakness on a clinical indicator. PlainNHS does not currently publish clinical outcome measures (SHMI, surgical mortality, infection rates).
  • Case-mix bias. Tertiary specialist Trusts (the major teaching hospitals) treat more complex cases on average than community Trusts. Their A&E and RTT figures are not directly comparable to a small district general hospital's figures.
  • Reporting lag. All NHS operational statistics are published with a one-to-two-month lag. The figure you see today reflects the position one to two months ago, not the current position.

Original research

For deeper analysis, see our research papers: RTT performance by NHS region, CQC rating versus operational performance, and inter-Trust variation in procedure waiting times.