0240 Greenspace in Relation to Sleep Health among a Racially and Ethnically Diverse Cohort of US Women

Abstract

Abstract Introduction Exposure to greenspace has been associated with better sleep health by potentially supporting salubrious activities (e.g., physical activity), buffering noise, improving air quality, and promoting mental health. However, most prior studies have included few sleep dimensions or lacked racial/ethnic diversity. Further, access to greenspace is not equitably distributed across racial/ethnic groups due to structural racism, including environmental justice issues. Methods To investigate cross-sectional associations between greenspace with sleep health, overall and by race/ethnicity, we used data collected at enrollment (2003-2009) from women in the Sister Study (n=1,575 Hispanic/Latina, n=4,421 non-Hispanic (NH)-Black, and n=41,628 NH-White). Participants’ home addresses (X-Y coordinates) were linked to NASA’s Moderate Resolution Imaging Spectroradiometer Normalized Difference Vegetation Index data (250m resolution) during July of the year of enrollment to capture tertiles of proximity to greenspace. Participants reported multiple sleep dimensions including short sleep duration (< 7 hours), insomnia symptoms, frequent napping, and sleep debt (≥2-hour difference between average longest and shortest sleep duration during a week). Adjusting for both individual- and neighborhood-level sociodemographic characteristics, log Poisson regression with robust variance estimated prevalence ratios (PRs) for low/moderate vs. high greenspace associated with poor sleep, overall and by race/ethnicity. Results Among participants (mean±SD age=55.7±9.0 years), Hispanic/Latina and NH-Black participants comprised 8% of the population with high greenspace, 15% with low/moderate greenspace, and reported shorter sleep duration and poorer sleep quality compared to NH-White participants. After adjustment for sociodemographic characteristics, neighborhood disadvantage, and population density, low/moderate vs. high greenspace was associated with an 8% higher prevalence of frequent napping (PR=1.08 [95% CI:1.02-1.15]). Low/moderate greenspace was also marginally associated with a higher prevalence of short sleep duration (PR=1.01 [0.98-1.05]), insomnia symptoms (PR=1.03 [0.99-1.07]), and comorbid short sleep with insomnia symptoms (PR=1.04 [0.99-1.10]) but was not associated with sleep debt. Associations did not vary by race/ethnicity. Conclusion Low or moderate greenspace was marginally associated with poorer sleep across racial/ethnic groups, supporting greenspace as beneficial for all. Although replication with longitudinal data and objective sleep measures is warranted, greenspace interventions may improve population sleep health; equitable access may help address racial/ethnic sleep disparities. Support (if any) NIEHS (Z1AES103325[CLJ] and Z01ES044005[DPS]):