Assessing Volume of Accelerometry Data for Reliability in Preschool Children
Assessing Volume of Accelerometry Data for Reliability in Preschool Children
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DOI：
10.1249/mss.0b013e3182661478
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发表时间：
2012-12-01
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影响因子：
--
通讯作者：
Salmon, Jo
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文献类型：
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作者：
Hinkley, Trina;O'Connell, Eoin;Salmon, Jo
欣克利，T.，E.奥特维尔，A. D.好的，D。克劳福德，K。Hesketh，and J. Salmon.评估学龄前儿童加速度计数据的可靠性。医学科学体育锻炼：第44卷，第12期，第114页。2436-2441，2012。目的：本研究探讨了可靠地估计学龄前儿童的身体活动所需的加速度数据量（h.d（-1））以及是否有必要包括工作日和周末的数据。研究方法：来自墨尔本健康活跃学龄前儿童研究的493至799名（取决于佩戴时间）学龄前儿童的加速度计数据被使用。每个孩子在总（轻度-剧烈）体力活动中所花费的穿戴时间百分比是主要结果。分析每日数据的小时增量。t检验，控制年龄和聚集的招募中心，评估工作日和周末的身体活动之间的差异。组内相关系数估计的可靠性为个别一天。斯皮尔曼-布朗预测公式估计了达到可靠性估计值0.7、0.8和0.9所需的天数。结果如下：无论最低活动时数是多少，周末儿童的体育活动时间比例均显著高于平日（t = 12.49-16.76，P < 0.001）。随着每天数据小时数的减少，达到每个预定可靠性估计所需的天数也会增加。例如，需要2.7-2.8天的数据才能达到可靠性估计值0.7，每天需要10小时或更多的数据;需要3.3-3.4天才能达到相同的可靠性估计值，每天需要7小时的数据。结论：未来的研究应确保包括本研究中确定的最低数据量（每天小时数和天数），以满足至少0.7的可靠性水平，并应报告其研究的可靠性水平。除了工作日之外，分析中还应包括至少一个周末，以可靠地估计学龄前儿童的身体活动水平。
HINKLEY, T., E. O'CONNELL, A. D. OKELY, D. CRAWFORD, K. HESKETH, and J. SALMON. Assessing Volume of Accelerometry Data for Reliability in Preschool Children. Med. Sci. Sports Exerc., Vol. 44, No. 12, pp. 2436-2441, 2012. Purpose: This study examines what volume of accelerometry data (h.d(-1)) is required to reliably estimate preschool children's physical activity and whether it is necessary to include weekday and weekend data. Methods: Accelerometry data from 493 to 799 (depending on wear time) preschool children from the Melbourne-based Healthy Active Preschool Years study were used. The percentage of wear time each child spent in total (light-vigorous) physical activity was the main outcome. Hourly increments of daily data were analyzed. t-tests, controlling for age and clustering by center of recruitment, assessed the differences between weekday and weekend physical activity. Intraclass correlation coefficients estimated reliability for an individual day. Spearman-Brown prophecy formula estimated the number of days required to reach reliability estimates of 0.7, 0.8, and 0.9. Results: The children spent a significantly greater percentage of time being physically active on weekend compared with weekdays regardless of the minimum number of hours included (t = 12.49-16.76, P < 0.001 for all). The number of days required to reach each of the predetermined reliability estimates increased as the number of hours of data per day decreased. For instance, 2.7-2.8 d of data were required to reach a reliability estimate of 0.7 with 10 or more hours of data per day; 3.3-3.4 d were required to meet the same reliability estimate for days with 7 h of data. Conclusions: Future studies should ensure they include the minimum amount of data (hours per day and number of days) as identified in this study to meet at least a 0.7 reliability level and should report the level of reliability for their study. In addition to weekdays, at least one weekend day should be included in analyses to reliably estimate physical activity levels for preschool children.