20-10-21, add close contact analysis

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2021-10-20 13:08:32 +01:00
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--* A mean number of 4.2 notifications were sent per user who tested positive and accepted contact tracing--
* As of 6th October 2021, ~6.9 million contact tracing alerts have been sent ([from NHS](https://stats.app.covid19.nhs.uk/#contact-tracing-alerts), "Number of contact tracing alerts sent (England)") with ~2.1 million positive tests reported in app (same link, "Number of test results linked to the app (England)", "Total positive test results")
* Therefore, notifications were sent to, on average, roughly 3 people who came into 'close contact' with a person who tested positive and reported it.