Project Sport Brazil (PROESP-Br), School of Physical Education, Physiotherapy and Dance, Post-graduation Program in Human Movement Sciences, Federal University of Rio Grande do Sul, Street: Felizardo, 750, Neighborhood: Jardim botânico, Porto Alegre, Brazil.
Research Center on Physical Activity, Health and Leisure (CIAFEL), Faculty of Sport, University of Porto, Street: Dr. Plácido da Costa, 91.4200-450 Porto, Portugal.
Public Health. 2019 Mar;168:9-16. doi: 10.1016/j.puhe.2018.11.021. Epub 2019 Jan 18.
The objective of the study is to examine whether adolescents' road safety perception (RSP) acts as a mediator on the association between the distance from home to the nearest park and the use of the parks for physical activity (PA).
This is a cross-sectional study.
The evaluation was through a random sample of 1130 adolescents (534 male), corresponding to 47.3%, 14-20 years old, from Porto Alegre, Brazil. RSP was assessed through some questions of the Neighborhood Environment Walkability Scale for Youth. Park use, socioeconomic status, age, and sex were measured using a questionnaire. Distance from home to the nearest park was evaluated through geographic information system. Data analysis was performed using Pearson correlation, and linear regression models were fitted as per the Baron and Kenny procedures for mediation analyses. All analyses were adjusted for sex and socioeconomic status.
Road safety perception is independently associated with less distance from home to the nearest park (P = 0.04) and use of the parks for PA (P = 0.02). Road safety perception is a mediator and explains 16% of the association between park use and distance from home to the park (indirect Effect = -40.9966; 95% confidence interval [CI]: 119.3733-2.2455).
Our findings indicated that RSP is a mediator on the association between the distance from home to the nearest park and the use of the parks for PA. Future studies should take this into consideration frequency and intensity of PA and other environmental characteristics, such as crime, aesthetics, and neighborhood facilities.
本研究旨在探讨青少年道路安全感知（RSP）是否在从家到最近公园的距离与使用公园进行体育活动（PA）之间的关联中起中介作用。
这是一项横断面研究。
评估是通过对巴西阿雷格里港的 1130 名青少年（534 名男性）的随机样本进行的，其中 47.3%为 14-20 岁。RSP 通过青年邻里环境步行能力量表的一些问题进行评估。公园使用、社会经济地位、年龄和性别通过问卷进行测量。通过地理信息系统评估离家到最近公园的距离。使用 Pearson 相关分析进行数据分析，并根据 Baron 和 Kenny 程序进行线性回归模型拟合，以进行中介分析。所有分析均根据性别和社会经济地位进行调整。
RSP 与离家到最近公园的距离较近（P=0.04）和使用公园进行 PA 独立相关（P=0.02）。RSP 是一个中介变量，解释了公园使用与离家到公园的距离之间关联的 16%（间接效应=-40.9966；95%置信区间[CI]：119.3733-2.2455）。
我们的研究结果表明，RSP 是离家到最近公园的距离与使用公园进行 PA 之间关联的中介。未来的研究应考虑 PA 的频率和强度以及其他环境特征，如犯罪、美学和邻里设施。
