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Table 6 Accelerations (m*s-2) needed to produce 1000 accelerometer count*min-1. Data are means and standard deviations calculated in four different settings at three different time points in the mechanical setting.

From: Unit-specific calibration of Actigraph accelerometers in a mechanical setup – Is it worth the effort? The effect on random output variation caused by technical inter-instrument variability in the laboratory and in the field

  Setting #1 Setting #2 Setting #3 Setting #4
MTI (November) 0.5026 (0.0124) 0.4144 (0.0110) 0.3724 (0.0084) 0.4245 (0.0117)
CSA (November) 0.5483 (0.0476) 0.4599 (0.0365) 0.3950 (0.0329) 0.4658 (0.0345)
MTI (January) 0.4932 (0.0199) 0.4053 (0.0157) 0.3627 (0.0157) 0.4141 (0.0162)
CSA (January) 0.5453 (0.0492) 0.4582 (0.0388) 0.3913 (0.0332) 0.4647 (0.0374)
MTI (March) 0.4908 (0.0245) 0.4048 (0.0187) 0.3654 (0.0172) 0.4149 (0.0175)
CSA (March) 0.5368 (0.0534) 0.4509 (0.0408) 0.3874 (0.0360) 0.4583 (0.0374)
  1. When compared to the CSA units the MTI instruments, on average, needed significantly (p < 0.001) less acceleration in order to produce 1000 counts*min-1