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, published by the regulator rather than by us. 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 still waiting with an elapsed wait within the operational reference?

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

Source: NHS England Referral to Treatment (RTT) waiting times · 2026 Operational standards discussed here follow NHS England's published RTT and A&E statistical work areas.

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 and inter-Trust variation in procedure waiting times.