Abstract：
We investigated whether neighborhood greenspaces were associated with physical activity in adulthood over 3 cohort visits after considering perceived safety and neighborhood contextual factors. We also evaluated whether the association with greenspace varied by neighborhood socioeconomic status. Participants (N = 4,800) from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) residing in two Brazilian state capitals were evaluated in Visits 1 (2008-2010), 2 (2012-2014) and 3 (2017-2019). Greenspaces were categorized by quintiles of positive Normalized Difference Vegetation Index (NDVI) scores. Physical activity frequency was given by the number of visits at which participants reported moderate/vigorous physical activity (none, 1 or 2, and 3 visits). We used multinomial logistic regression. After adjustment for age, sex, education, research center, residence in slums, individuals in the 4th and 5th NDVI quintiles showed 73% higher odds of physical activity over 3 visits than those in the 1st quintile (4th quintile: 95%CI = 1.24-2.43; 5th quintile: 95%CI = 1.24-2.41). The strength of the association was attenuated after adjustment for perceived safety. After adjustment for contextual factors quantity of sidewalks and streetlights, the OR for the 4th and 5th NDVI quintiles decreased to 1.66 (95%CI = 1.18-2.33) and 1.62 (95%CI = 1.16-2.28), respectively. Finally, after including average household income per capita, the OR for physical activity in 3 visits for the 4th and 5th NDVI quintiles decreased to 1.48 (95%CI = 1.04-2.12) and 1.43 (95%CI = 1.00-2.04; p = 0.053), respectively. Greater greenspace contributed to sustained physical activity during the eight years of follow-up, indicating the potential contribution of public greenspaces to reducing health-related inequalities.
摘要：
在考虑了感知的安全性和邻里背景因素后，我们在3次队列访问中调查了成年后邻里绿地是否与身体活动相关。我们还评估了与绿地的关联是否因邻里社会经济地位而异。来自巴西两个州首府的巴西成人健康纵向研究（ELSA-Brasil）的参与者（N=4,800）在访问1（2008-2010）中进行了评估，2（2012-2014）和3（2017-2019）。绿地按正正归一化植被指数（NDVI）得分的五分位数进行分类。身体活动频率由参与者报告中等/剧烈身体活动的访问次数给出(无，1或2次，以及3次访问)。我们使用多项逻辑回归。调整后的年龄，性别,教育,研究中心,居住在贫民窟，第4位和第5位NDVI第5位的个体在3次访视中的体力活动几率比第1位NDVI第5位的个体高73%(第4位:95CI=1.24~2.43;第5位:95CI=1.24~2.41).在对感知的安全性进行调整后，关联的强度减弱。经过上下文因素调整后，人行道和路灯的数量，第4和第5个NDVI五分位数的OR下降到1.66(95CI=1.18-2.33)和1.62(95CI=1.16-2.28)，分别。最后,计算家庭人均收入后，在第4次和第5次NDVI五分位数的3次访问中，体力活动的OR下降到1.48（95CI=1.04-2.12）和1.43（95CI=1.00-2.04；p=0.053），分别。在八年的随访中，更大的绿地有助于持续的身体活动，表明公共绿地对减少健康相关不平等的潜在贡献。
