- Cost: The Chinese source describes checking nearby greenery while viewing a home as requiring little time and no separate fee. This does not mean moving to a greener area is free or affordable.
- In plain language: The cited analysis associates more greenery near home with lower mortality. It measures residential vegetation, not how often people visit parks. Wealth, air quality and physical activity may also matter, so the finding should not be interpreted as proof that park visits extend life.
- Benefit: The Chinese source describes a meta-analysis of nine long-term cohort studies in seven countries, involving about 8.32 million people. Greenery was assessed using the normalized difference vegetation index (NDVI) around homes, within a 500-metre buffer. It reports a pooled hazard ratio of 0.96 (95% CI 0.94–0.97) for each 0.1-unit increase in NDVI, with seven studies finding an inverse association and two finding no association. These source-reported figures remain pending independent primary-paper review. A hazard ratio describes relative hazards over follow-up, not an individual's absolute probability of death or a guaranteed gain in lifespan.
- Evidence grade: A, assigned by the Chinese source; not an independent RecheckNest approval.
- Source: Rojas-Rueda D, Nieuwenhuijsen MJ, Gascon M, Perez-Leon D, Mudu P (2019). Green spaces and mortality: a systematic review and meta-analysis of cohort studies. The Lancet Planetary Health, 3(11), e469–e477. https://doi.org/10.1016/S2542-5196(19)30215-3
- Notes: The source flags substantial differences among study results, reporting I²=95%. Observational studies cannot fully separate greenery from other correlated circumstances. NDVI is an index of vegetation; the source informally compares a 0.1-unit increase with moving from a bare neighbourhood to a tree-lined one. That physical interpretation has not been validated here and is not a fixed conversion across landscapes or datasets.
Editorial scope: This is a translation and evidence candidate, not a verified housing or health recommendation. Study definitions, estimates, heterogeneity, geographic scope and independent bilingual and risk review remain unfinished. The archived Chinese source is unchanged. Not approved for publication.