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City of London local authority · 2021

The missing millions — locally

7.9%

Adults estimated to have undiagnosed hypertension.

Estimated prevalence of undiagnosed adult hypertension · Persons, 16+ yrs

England: 8.6% · 2021

healthcards · City of London · 2021

What this means

An estimated 644 adults in City of London have high blood pressure without knowing it — on top of those diagnosed. That is why blood-pressure checks in pharmacies, GP surgeries and community events matter.

95% confidence interval: 7.5–8.7 %. Source population denominator: 8,108 (Persons, 16+ yrs); this measure is modelled, not a direct count of cases.

Fingertips marks this indicator Not compared to England — shown for context only.

Recorded value (City of London)

  1. 2021: 7.9%

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Source & provenance

Indicator:
Estimated prevalence of undiagnosed adult hypertension (ID 94111)
Source:
OHID, based on ONS and NHS England data (Health Survey for England modelling)
Area:
City of London (E09000001), Upper-tier local authority (post Apr 2023)
Period:
2021; retrieved 2026-10-13 (distinct from reporting period)
Population:
Persons, 16+ yrs
Note:
Modelled estimate from Health Survey for England, applied to 2021.

View source ↗

Caveats

  • A 2021 modelled estimate. Treat as a ballpark, not a precise count.
  • Built from Health Survey for England blood-pressure measurements and reported diagnosis, then modelled to local populations.
  • Blood-pressure threshold used: 140/90 mmHg or above.
  • Lower means fewer adults walking around with unknown high blood pressure.

Missing or suppressed values are never shown as zero — every card above passed validation with a real numeric value.