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The association between green space and depressive symptoms in pregnant women: moderating roles of socioeconomic status and physical activity
  1. R R C McEachan1,
  2. S L Prady2,
  3. G Smith3,
  4. L Fairley4,
  5. B Cabieses1,5,
  6. C Gidlow6,
  7. J Wright1,
  8. P Dadvand7,
  9. D van Gent7,
  10. M J Nieuwenhuijsen7
  1. 1Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK
  2. 2Department of Health Sciences, University of York, York, UK
  3. 3Institute for Environment and Sustainability Research, Staffordshire University, Stoke-on-Trent, UK
  4. 4Division of Epidemiology and Biostatistics, University of Leeds, Leeds, UK
  5. 5Faculty of Medicine- Clínica Alemana de Santiago, Universidad del Desarrollo, Santiago, Chile
  6. 6Centre for Sport, Health and Exercise Research, Staffordshire University, Stoke-on-Trent, UK
  7. 7Centre for Research in Environmental Epidemiology (CREAL), Barcelona, Spain
  1. Correspondence to Dr RRC McEachan, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, Bradford Royal Infirmary, Duckworth Lane, Bradford, BD9 6RJ, UK; rosie.mceachan{at}bthft.nhs.uk

Abstract

Background The current study explored the association between green space and depression in a deprived, multiethnic sample of pregnant women, and examined moderating and mediating variables.

Method 7547 women recruited to the ‘Born in Bradford’ cohort completed a questionnaire during pregnancy. A binary measure of depressive symptoms was calculated using a validated survey. Two green space measures were used: quintiles of residential greenness calculated using the normalised difference vegetation index for three neighbourhood sizes (100, 300 and 500 m buffer zones around participant addresses); access to major green spaces estimated as straight line distance between participant address and nearest green space (>0.5 hectares). Logistic regression analyses examined relationships between green space and depressive symptoms, controlling for ethnicity, demographics, socioeconomic status (SES) and health behaviours. Multiplicative interactions explored variations by ethnic group, SES or activity levels. Mediation analysis assessed indirect effects via physical activity.

Results Pregnant women in the greener quintiles were 18–23% less likely to report depressive symptoms than those in the least green quintile (for within 100 m of green space buffer zone). The green space-depressive symptoms association was significant for women with lower education or who were active. Physical activity partially mediated the association of green space, but explained only a small portion of the direct effect.

Conclusions Higher residential greenness was associated with a reduced likelihood of depressive symptoms. Associations may be stronger for more disadvantaged groups and for those who are already physically active. Improving green space is a promising intervention to reduce risk of depression in disadvantaged groups.

  • DEPRESSION
  • DEPRIVATION
  • Environmental epidemiology
  • ETHNICITY
  • PREGNANCY

This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/

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