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More Green Space Linked to Fewer Mental Health Hospitalizations, Global Study Finds
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A new analysis of data spanning two decades and seven countries reveals a important correlation between increased exposure to green spaces and a reduction in hospital admissions for mental disorders.
Mental wellbeing is a pressing global concern,with an estimated 1.1 billion peopel experiencing mental disorders in 2021 – contributing to 14% of the global disease burden and considerable economic and societal costs.Now, groundbreaking research published today in the BMJ suggests a simple, scalable solution: more green space.
The Protective Power of Greenness
The comprehensive study, led by researchers at Monash University in Australia, analyzed 11.4 million hospital admissions for mental disorders from 6,842 locations across australia, Brazil, Canada, Chile, New Zealand, South Korea, and Thailand between 2000 and 2019. Researchers found that greater local greenness – measured using the normalized difference vegetation index (NDVI), a satellite-derived metric for assessing vegetation levels – was associated with a 7% reduction in hospital admissions for all cause mental disorders.
The benefits were even more pronounced for specific conditions. Hospitalizations related to substance use disorders saw a 9% reduction, while those for psychotic disorders and dementia decreased by 7% and 6%, respectively. Though, the study also highlighted variability, with the strength of the association differing across countries and specific disorders.
“This provides clear evidence that should inform urban design and health policy to better protect mental health,” stated a led researcher.
Regional Variations and Urban Impact
Interestingly, the protective effects of greenness weren’t uniform. While brazil, Chile, and Thailand consistently showed positive associations across most disorders, Australia and Canada experienced modestly increased risks for all-cause mental disorders and several specific conditions with greater greenness. This suggests that contextual factors – such as climate, cultural practices, and existing urban infrastructure – play a crucial role.
The strongest protective associations were observed in urban areas, where an estimated 7,712 hospital admissions for mental disorders annually could potentially be prevented by increasing exposure to green spaces. This finding underscores the importance of integrating nature into city planning. .
seasonal Shifts and Future Research
Researchers also identified seasonal patterns in urban areas, indicating that climate and weather conditions influence how people utilize and perceive green spaces. Further analysis revealed that a 10% increase in greenness correlated with fewer hospital admissions, ranging from approximately 1 per 100,000 in South Korea to around 1,000 per 100,000 in New Zealand.
This study is observational in nature, meaning it cannot definitively prove a cause-and-effect relationship.The researchers acknowledge the limitations of relying on hospital admission data and note that their findings likely underestimate the full scope of mental health challenges, as they only capture severe cases requiring inpatient care.
Despite these limitations, the findings suggest that a significant proportion
