Residential green space and pathways to term birth weight in the Canadian Healthy Infant Longitudinal Development (CHILD) Study

International Journal of Health Geographics

the CHILD Study Investigators¹  Perry Hystad²  Theo Moraes³  Padmaja Subbarao³  Angela Chow⁴  Malcolm R. Sears⁵  Andrew Larkin⁶  Leanne Cusack⁶  Tim K. Takaro⁷  Anita Kozyrskyj⁸  Piush J. Mandhane⁸  Stuart E. Turvey⁹  Hind Sbihi⁹  Allan B. Becker^1,10  Meghan B. Azad^1,10  Jeffrey R. Brook^1,11 

[1] ;College of Public Health and Human Sciences, Oregon State University;Hospital for Sick Children;Indiana University;McMaster University;Oregon State University;Simon Fraser University;University of Alberta;University of British Columbia;University of Manitoba;University of Toronto;

关键词: Green space;    Nature;    Built environment;    Birth weight;    Birth outcomes;   

DOI  :  10.1186/s12942-018-0160-x

来源: DOAJ

【 摘 要 】

Abstract Background A growing number of studies observe associations between the amount of green space around a mother’s home and positive birth outcomes; however, the robustness of this association and potential pathways of action remain unclear. Objectives To examine associations between mother’s residential green space and term birth weight within the Canadian Healthy Infant Longitudinal Development (CHILD) study and examine specific hypothesized pathways. Methods We examined 2510 births located in Vancouver, Edmonton, Winnipeg, and Toronto Canada. Green space was estimated around mother’s residences during pregnancy using Landsat 30 m normalized difference vegetation index (NDVI). We examined hypothesized pathways of: (1) reduction of environmental exposure; (2) built environment features promoting physical activity; (3) psychosocial conditions; and (4) psychological influences. Linear regression was used to assess associations between green space and term birth weight adjusting first for a comprehensive set of confounding factors and then incrementally for pathway variables. Results Fully adjusted models showed non-statistically significant increases in term birth weight with increasing green space. For example, a 0.1 increase in NDVI within 500 m was associated with a 21.5 g (95% CI − 4.6, 47.7) increase in term birth weight. Associations varied by city and were most robust for high-density locations. For the two largest cities (Vancouver and Toronto), we observed an increase in birth weight of 41.2 g (95% CI 7.8, 74.6) for a 0.1 increase in NDVI within 500 m. We did not observe substantial reductions in the green space effect on birth weight when adjusting for pathway variables. Conclusion Our results highlight the need to further characterize the interactions between green space, urban density and climate related factors as well as the pathways linking residential green space to birth outcomes.

【 授权许可】

Unknown