Associations of residential greenness and ambient air pollution with overweight and obesity in older adults
Authors' conclusion
Greenness exposure appears to lower the risk of overweight/obesity in older adults in China, whereas PM2.5 , acting as a mediator, partly mediated this protective effect.
Study context
- Population
- Adults aged ≥65 years in China, Chinese Longitudinal Healthy Longevity Survey 2000–2018
- Participants
- 21,355 adults
- Exposure
- Residential greenness and PM2.5 exposure
- Outcome
- Incident overweight/obesity
Methodological detailsChinese Longitudinal Healthy Longevity Survey 2000–2018, Cox proportional hazards models, interaction and mediation analyses
- Chinese Longitudinal Healthy Longevity Survey 2000–2018
- Cox proportional hazards models
- Interaction and mediation analyses
Main finding
As reported in the abstract
Incident cases of overweight/obesity
1895 over 109,566 person-years
HR per 0.1-unit increase in normalized difference vegetation index (NDVI)
0.91
95% CI 0.88–0.95
HR per 10-μg/m³ increase in PM2.5
1.11
95% CI 1.07–1.14
Observational data: associations, not effects.
Further findings
Mediation of NDVI effect on overweight/obesity by PM2.5
- Relative mediation proportion
- 20.10% (95% CI: 1.63%-38.57%)
- Partial mediation
Original publication
Associations of residential greenness and ambient air pollution with overweight and obesity in older adults. Obesity (Silver Spring). Published 30 August 2023. doi:10.
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