Results
HEAT
As shown by the two heat maps (Fig. Heat map of pressure for a patient at three different changes and correlation of pressure between changesIf the correlation coefficient was above 0.99, pairs of frames show almost no difference in the number of activated sensors (Fig. Boxplot of difference in activated sensors (Panel Figure Change of correlation coefficient within 24 h at different sampling frequenciesPlot changes in correlation coefficients, mean pressure values, number of activated sensors, and number of sensors with pressure value > 40 mm Hg over 24 h at a sampling frequency of every 60 s are illustrated in Fig. Change of correlation coefficients, mean pressure, and number of activated sensors (with pressure > 40 mmHg) over 24 h for a randomly selected patient at sampling frequency of every 60 s‘Not-on-bed’ times were similar at sampling frequencies of 30 s and 60 s for the four study participants (Fig. Time not-on-bed during study period for the four study participantsNext, we defined a position change as occurring if correlation coefficients were below a pre-established threshold value. Use of high threshold value for the correlation coefficient could lead to the detection of partial position change, such as limb or head movement. As expected, active time depends on the selection of correlation coefficient thresholds (Fig. Sum of active time (movement) within 24 h from randomly selected four patients at different sampling frequency (every 30 s, 60 s, 120 s) (Panel Lastly, the number of position changes captured decreased as we lowered the threshold of correlation coefficients (Fig. 