Upping green space could narrow lifespan gap between poorest and richest areas
Published 18th October 2022
Upping the amount of natural (green and blue) space and private gardens has the potential to narrow the lifespan gap between those living in the most and least deprived areas, suggests new MRC/CSO Social and Public Health Sciences Unit research published in the Journal of Epidemiology of Community Health.
Each 10% increase in natural space is linked to a 7% fall in the incidence of early death among the under 65s, the findings indicate. An increased amount of natural space within local areas was also associated with reduced disparity in years of life lost (YLL) between the most and least deprived areas.
The idea that the natural environment provides health benefits isn’t new: there’s strong evidence that greater access and exposure to natural space has a direct positive impact on health.
But it’s not clear if access to natural space might also be associated with differences in lifespan and protection against an earlier than expected death, so the researchers used the measure of YLL for short to try and find out.
They drew on YLL data from the 2016 Scottish Burden of Disease, reflecting the gap between expected and actual lifespan for men and women under 65 who were resident in Scotland, UK, at time of death.
The YLL data were divided up by ‘datazone’- defined as a geographical unit of approximately 500–1000 household residents that aligns with physical boundaries and natural communities, has a regular shape, and contains households with broadly similar social characteristics.
The Ordnance Survey Mastermap was used to track areas of natural space of private gardens in square metres.
Natural space was defined as: woodland; scattered trees; scrub; marsh; heath; open water (inland or tidal); semi natural grassland; general natural areas, such as grass on sports pitches, roadside verges, and farmland; agriculture; hard bare ground, such as rocks, boulders, and cliffs; and soft bare ground, such as sand, soil, and foreshore.
Areas with the highest income deprivation had the lowest average percentage cover of natural space and gardens (58.5%, 49–65%). People living in these areas had the highest levels of ill health.
The study found that for every 10% increase in natural space cover was associated with a 7% fall in the incidence of premature death. Increased availability of natural space within local areas was also associated with a reduction in the disparity in YLL between the most and least deprived areas. Even moderate levels of natural space appeared to be able to reduce the inequality in SIRs for both men and women.
“In practice, not everyone can live in an area with a high percentage of green or natural space; however, this does not mean that even small amounts of such areas are not beneficial,” points out Professor Rich Mitchell.
This is an observational study, and as such, can’t establish cause and effect. And the researchers acknowledge that they didn’t have information on individual lifestyle behaviour and personal economic circumstances, or how much people used their local natural space or its quality, all of which may have influenced their findings.
But their findings echo those of other studies. And they conclude: “An increased amount of natural/green spaces within local areas has the potential to reduce the disparity in YLL between the most and least income deprived areas—the ‘equigenic’ effect. Natural spaces and private gardens should be an important feature in any building/ development planning.”
The paper, Neighbourhood natural space and the narrowing of socioeconomic inequality in years of life lost: a cross sectional ecological analysis of the Scottish Burden of Disease, is published in the Journal of Epidemiology and Community Health.
First published: 18 October 2022