Timed motor function test using video-based observation and online-based observation methods among children: A reliability and validity study

Background and aims: 10 meters walk test (10MWT) is used to check the motor functions like walking abilities in children. Study aims to find reliability and validity of 10MWT using video (VBO) and online based (OBO) observation with direct observation (DO).
Methods: For reliability and validity study, 75 children of both genders, age group between 8 and 12 years were recruited based on simple random sampling. After anthropometrics, 10MWT was performed using VBO and OBO methods. Concurrent validity of VBO and OBO were established with DO method. In addition to above, test-retest and intrarater reliabilities were established.
Results: Age, height, weight, and limb length of children were 10.1 (8-12 years), 141 (123-165 cm), 47.7 (27.95-67.10 kg), 75.7 (67-91.5 cm) respectively. Validity of DO method with VBO and OBO methods were r =0.86 and r = 0.85 (P <0.001) respectively. Intrarater reliability for the 10MWT with DO, VBO and OBO were ICC = 0.827, 0.646 and 0.659 respectively. Test-retest reliability of 10MWT with DO, VBO and OBO were ICC = 0.74, 0.68, and 0.70 respectively.
Conclusion: VBO and OBO method have good validity and reliability with DO method.
Clinical Implications: VBO and OBO methods can be used in clinical settings where DO method is not feasible.

研究背景与目的：10米步行测试（10-meter Walk Test, 10MWT）是用于评估儿童步行能力等运动功能的常用手段。本研究旨在探讨采用视频观察法（Video-based Observation, VBO）、线上观察法（Online-based Observation, OBO）以及直接观察法（Direct Observation, DO）开展10MWT的信度与效度。
研究方法：本信效度研究通过简单随机抽样方法，招募了75名年龄介于8至12岁的男女儿童。完成人体测量学指标采集后，分别采用VBO与OBO两种方式开展10MWT测试。以DO为金标准，确立VBO与OBO的同时效度；此外还分别建立了重测信度与评定者内信度。
研究结果：受试者的年龄、身高、体重与肢体长度分别为10.1岁（范围8~12岁）、141cm（范围123~165cm）、47.7kg（范围27.95~67.10kg）与75.7cm（范围67~91.5cm）。以DO为参照时，VBO与OBO的效度相关系数分别为r=0.86与r=0.85（P<0.001）。DO、VBO及OBO三种方式下10MWT的评定者内信度组内相关系数（Intraclass Correlation Coefficient, ICC）分别为0.827、0.646与0.659；三种方式的重测信度ICC分别为0.74、0.68与0.70。
研究结论：VBO与OBO两种观察方式与DO方法均具有良好的效度与信度。
临床意义：当直接观察法（DO）无法实施的临床场景中，可采用VBO与OBO方法开展相关运动功能评估。