Health,
sub-category by sub-category
5 health categories, each asked the questions real UK consumers ask, every month. Do they behave like one market or several? On the measures below, Health behaves like 5 different markets.
They agree on model agreement. They split on read → cited.
Each strip is one measure. The grey band is the programme's full range; the gold span is where Health's sub-categories sit inside it, one dot each. A ratio under 1 means they cluster tighter than the programme — a category with a shared logic — and over 1 means they are further apart than categories chosen at random.
The data behind this chart
| Measure | Sub-category | Value | Within-category spread | Programme spread | Ratio |
|---|---|---|---|---|---|
| Concentration | Pain Relief | 66% | 15.2 | 14.6 | 1.04 |
| Health Insurance | 60% | ||||
| Private Healthcare | 35% | ||||
| Dental Care | 33% | ||||
| Vitamins & Supplements | 29% | ||||
| Leader visibility | Pain Relief | 90% | 30.6 | 22.7 | 1.35 |
| Health Insurance | 33% | ||||
| Private Healthcare | 22% | ||||
| Vitamins & Supplements | 10% | ||||
| Dental Care | 5% | ||||
| Read → cited | Dental Care | 57% | 18.6 | 11.8 | 1.57 |
| Vitamins & Supplements | 30% | ||||
| Health Insurance | 21% | ||||
| Private Healthcare | 19% | ||||
| Pain Relief | 0% | ||||
| Model agreement | Pain Relief | 100% | 20.0 | 34.1 | 0.59 |
| Health Insurance | 50% | ||||
| Private Healthcare | 50% | ||||
| Dental Care | 50% | ||||
| Vitamins & Supplements | 50% |
Bupa holds 2 of 5 crowns.
The most-named brand in each sub-category's answers. A brand that leads more than one sub-category is the clearest sign of a category with a single logic: buyers, and the models, reach for the same name whatever the question. 4 of the 5 leaders are upsets: not the market leader the programme seeded.
9 sources referee more than one health category.
The independent sources AI cites in the answers — counted only where they appear in the top sources of at least two of Health's sub-categories. nhs.uk is trusted across 4 of 5: the place a health brand needs to be seen whatever it sells.
Brand pages convert 57% of reads in dental care, 0% in pain relief.
When Claude or ChatGPT opens a brand's own page while answering, how often does it make the cited sources? The spread inside Health is as wide as the programme's: what gets cited differs sub-category by sub-category.
Every health story, and every other category.
Method: every sub-category runs 20 unbranded consumer prompts monthly against ChatGPT, Claude and Gemini. Alikeness compares each measure's spread within Health to its spread across every category in the programme (population standard deviations); model agreement is the share of models naming the same leader; read→cited uses Claude and ChatGPT only. Correlational observations of model behaviour at the time of each run. Data updated Wed, 02 Sep 2026 05:14:00 GMT.