Indoor Versus Outdoor Time in Preschoolers at Child Care
Indoor Versus Outdoor Time in Preschoolers at Child Care
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DOI：
10.1016/j.amepre.2012.09.052
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发表时间：
2013-01-01
影响因子：
5.5
通讯作者：
Christakis, Dimitri A.
中科院分区：
文献类型：
--
作者：
Tandon, Pooja S.;Saelens, Brian E.;Christakis, Dimitri A.
背景：户外活动可能对健康有益，包括更多的身体活动。由于户外时间难以测量，人们很难理解户外时间与健康之间的关系。目的：探讨光感器和GPS方法量化3-5岁幼儿户外活动时间的准确性和有效性。方法：来自5个托儿中心的45名儿童（平均年龄4.5岁，男孩占64%）在托儿期间腰上佩戴了内置光传感器的便携式加速度计和单独的GPS设备，共提供80,648次（每次15秒）用于分析。每个中心对儿童在室外和室内进行了2天的直接观察（金标准）。通过个人活动和位置测量系统处理的GPS信噪比用于确定室内和室外位置。受试者工作特征（ROC）分析用于确定界定室内与室外的阈值。数据收集于2011年秋季，分析于2012年。结果：平均观察室外时间63 [+/-44]；范围：18-152]分钟/天。室外的平均光感器水平明显较高。所有天气条件下基于光传感器定位的ROC曲线下面积为0.82（范围：多云天0.70 ~晴天0.97）；GPS则为0.89。光传感器的灵敏度为74%，特异性为86%。GPS的敏感性为82%，特异性为88%。结论：光传感器和GPS设备对学龄前儿童室内和室外时间的区分具有中等到较高的准确性。这些装置可以提高学龄前儿童户外时间测量的可行性，降低测量成本。[J] .中华预防医学杂志，2013;44(1):85-88
Background: Being outdoors may have health benefits including being more physically active. Understanding the relationship between outdoor time and health is hampered by the difficulty of measuring outdoor time.Purpose: To examine the accuracy and validity of light-sensor and GPS methods for quantifying outdoor time among those aged 3-5 years at child care.Methods: A total of 45 children (mean age 4.5 years, 64% boys) from five child care centers wore portable accelerometers with built-in light sensors and a separate GPS device around their waists during child care, providing 80,648 episodes (15 seconds each) for analysis. Direct observation (gold standard) of children being outdoors versus indoors was conducted for 2 days at each center. GPS signal-to-noise ratios, processed through the Personal Activity and Location Measurement System were used to define indoor versus outdoor locations. Receiver operating characteristic (ROC) analyses were used to determine thresholds for defining being indoors versus outdoors. Data were collected in Fall 2011, analyzed in 2012.Results: Mean observed outdoor time was 63 [+/-44; range: 18-152] minutes/day. Mean light-sensor levels were significantly higher outdoors. The area under the ROC curve for location based on light sensor for all weather conditions was 0.82 (range: 0.70 on partly cloudy days to 0.97 on sunny days); for GPS, it was 0.89. The light sensor had a sensitivity of 74% and specificity of 86%. GPS had a sensitivity of 82% and specificity of 88%.Conclusions: A light sensor and a GPS device both distinguish indoor from outdoor time for preschoolers with moderate to high levels of accuracy. These devices can increase the feasibility and lower the cost of measuring outdoor time in studies of preschool children. (Am J Prev Med 2013;44(1):85-88) (C) 2013 American Journal of Preventive Medicine