Let’s take Marmot’s contention that life expectancy in the poorest ward of Kensington and Chelsea is 22 years lower than in the richest. As with the Marmot Review into inequality, this fundamentally misunderstands the way life expectancy is measured.
Imagine a world in which Boris Johnson had succumbed to coronavirus – would that have registered as a change in life expectancy in London or New York? It would be recorded as one in London, the place of residence at time of death, not the place of birth. For the numbers used to calculate lifespans across geography are years lived allied with place of death – not the place of birth.
At the national level this is fair enough, even if not totally accurate. Some 15% of the current countrywide population is foreign born, so measuring lifespan by age and place of death is only ever going to be some 85% accurate. When the attempt is made to narrow this down to council ward level it’s not going to be accurate in the slightest. The assumption being made is that some useful portion die in that same little geographic area containing 5,000 or so people that we were born into. This is simply not supportable.
We don;t know the lifespan of the people born into an area. We only know the lifespan of someone who dies in an area.
The implication of this should be obvious. We have no information at all on the effects of childhood upon lifespan when allied with geography…..