Darcy Ummels

102 | Chapter 5 Physical behavior The mean dynamic, standing, and sedentary time during the activity protocol counted by the video observations were 422 (387–457), 668 (579–757), and 1716 (1452–1981) seconds, respectively. On average the total protocol lasted 45 (40–51) min. For the MOX MissActivity and MOX Annegarn , two outliers were detected for standing time, both outliers were visible in the Bland ‐ Altman plots. The video recordings were re ‐ watched and, in both participants, the MOX was incorrectly worn. One of these outliers was also statistically detected with the z ‐ score (5% with a z ‐ score of >2.58). One outlier for the activPAL was detected for dynamic time, the outlier was visible in the Bland ‐ Altman plot and was detected with the z ‐ score (5% with a z ‐ score of >3.29). The mean dynamic, standing, and sedentary time for the MOX MissActivity without outliers was 405 (338–473), 696 (504–889), and 1692 (1383–2001) seconds, respectively. For the MOX Annegarn the mean dynamic, standing, and sedentary time was 152 (131–174), 927 (712–1141), and 1715 (1392–2038), respectively. For the activPAL, the mean dynamic, standing, and sedentary time was 309 (255–364), 1256 (859–1645), and 1234 (946–1522) seconds respectively. The mean dynamic time for the Fitbit was 1 (0–3) minutes. Descriptive statistics without outliers for each activity tracker are shown in Table 5.4 and the descriptive statistics with outliers for each activity tracker are shown in Supplementary Table S5.1. The PE and APE for physical behavior are shown in Figure 5.4. To gain more insight in validity, not only based on total time but also on window ‐ to ‐ window basis, additional analyzes in terms of specificity, sensitivity, and accuracy were performed (Supplementary Table S5.2). The Bland ‐ Altman plots of the MOX MissActivity without outliers (Figure 5.5) show a slight overestimation for dynamic and sedentary time and a slight underestimation for standing time. When the limits of agreement for the activPAL are corrected for their bias for dynamic, standing, and sedentary time, they are − 141 to 147, − 538 to 527 and − 1234 to 1130 respectively.