ABSTRACT

Free-living comparability of wGT3X-BT and GT9X ActiGraphs has not been verified. Participants (n = 34, 35% females, 7–17 y) wore hip-worn monitors for one week. Vector magnitude (VM; 15-s epoch), Mean Amplitude Deviation (MAD) and Euclidean Norm Minus One (ENMO) (5-s epoch), and percent of time spent in each activity intensity (using cut-points) were calculated. At the epoch-level, correlations were strong (r = 0.822–0.963), mean absolute percent difference (MAPD) was 41.5 ± 62.2% (VM), 40.8 ± 52.7% (MAD), and 110.9 ± 74.0%, with moderate (ENMO κ = 0.664–0.789) to strong (VM κ = 0.915) agreement for activity intensity. When collapsed to the individual level, MAPD was 4.2 ± 3.4% (VM), 6.8 ± 3.7% (MAD), and 35.9 ± 26.1% (ENMO), correlations were moderate (ENMO r = 0.618) to high (MAD and VM r = 0.996), but ENMO, MAD, and time spent in activity intensities using ENMO cut-points were not statistically equivalent (using 2 one-sided tests) between monitors. While time spent in activity intensities was often comparable between models, caution is warranted for epoch-level comparisons.

摘要

wGT3X-BT和GT9X ActiGraphs的自由生活可比性尚未得到验证。参与者（n = 34，35％的女性，7-17岁）戴了一个破旧的监护仪一周。计算了矢量幅度（VM； 15秒），平均幅度偏差（MAD）和欧几里得减一（ENMO）（5秒），以及在每个活动强度上花费的时间百分比（使用切点）。在新纪元水平上，相关性很强（r =  0.822–0.963），平均绝对百分比差异（MAPD）为41.5±62.2％（VM），40.8±52.7％（MAD）和110.9±74.0％，中度（ ENMOκ= 0.664–0.789）到活动强度的强（VMκ= 0.915）一致性。当降至个体水平时，MAPD为4.2±3.4％（VM），6.8±3.7％（MAD）和35.9±26.1％（ENMO），相关性为中等（ENMO r= 0.618）到高（MAD和VM r = 0.996），但在两个监视器之间，ENMO，MAD和使用ENMO切点在活动强度上花费的时间在统计上不相等（使用2个单侧测试）。虽然模型之间的活动强度花费的时间通常是可比的，但在进行历时比较时要格外小心。