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Table 4 MTI instrument output derived when exposed to "golden standard" accelerations in the mechanical setup. 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

November 2003

N

Measured acceleration (Counts*min-1)

SD

CV (%)

Setting #1 (1.52 m*s-2)

25

3023 (2991–3054)

76 (59–106)

2.5

Setting #2 (2.08 m*s-2)

25

5015 (4960–5071)

134 (105–187)

2.7

Setting #3 (1.11 m*s-2)

25

2986 (2958–3013)

67 (53–94)

2.2

Setting #4 (3.38 m*s-2)

25

7967 (7876–8058)

219 (171–305)

2.7

January 2004

    

Setting #1 (1.52 m*s-2)

25

3083 (3029–3137)

132 (103–183)

4.2

Setting #2 (2.08 m*s-2)

25

5133 (5046–5219)

210 (164–292)

4.1

Setting #3 (1.11 m*s-2)

25

3070 (3012–3128)

141 (110–196)

4.6

Setting #4 (3.38 m*s-2)

25

8175 (8035–8315)

339 (265–472)

4.1

March 2004

    

Setting #1 (1.52 m*s-2)

23

3100 (3034–3167)

153 (119–217)

5.0

Setting #2 (2.08 m*s-2)

23

5142 (5042–5241)

230 (178–325)

4.5

Setting #3 (1.11 m*s-2)

23

3048 (2988–3108)

139 (108–197)

4.6

Setting #4 (3.38 m*s-2)

23

8160 (8013–8308)

341 (264–483)

4.2

  1. (N equals numbers of instruments)