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Table 3 Raw and calibrated instrument output recorded during free-living conditions in the field. MTI readings are obtained in third grade children and CSA readings are obtained in ninth grade adolescent. Data are means and standard deviations with 95% CI, and coefficients of variation.

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

  N Measured acceleration (Counts*min-1) SD CV (%)
Raw MTI output 389 724 (702–745) 219 (205–236) 30.2
Calibrated MTI output 389 724 (702–746) 220 (206–237) 30.4
Raw CSA output 296 446 (428–465) 162 (150–176) 36.3
Calibrated CSA output 296 440 (422–458) 157 (146–171) 35.7
  1. (N equals numbers of children/adolescents)