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Table 5 CSA instrument output derived when exposed to "gold 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 (1.61 m*s-2) 50 2952 (2883–3021) 243 (203–303) 8.2
Setting #2 (2.22 m*s-2) 50 4861 (4757–4965) 366 (306–456) 7.5
Setting #3 (1.16 m*s-2) 50 2952 (2887–3017) 229 (191–285) 7.8
Setting #4 (3.63 m*s-2) 50 7831 (7672–7990) 560 (468–698) 7.2
January 2004     
Setting #1 (1.61 m*s-2) 53 2970 (2900–3040) 253 (212–312) 8.5
Setting #2 (2.22 m*s-2) 53 4883 (4775–4992) 393 (330–486) 8.0
Setting #3 (1.16 m*s-2) 53 2981 (2916–3045) 234 (197–290) 7.8
Setting #4 (3.63 m*s-2) 53 7857 (7689–8026) 611 (512–756) 7.8
March 2004     
Setting #1 (1.61 m*s-2) 53 3021 (2945–3097) 275 (231–341) 9.1
Setting #2 (2.22 m*s-2) 53 4966 (4852–5080) 414 (347–512) 8.3
Setting #3 (1.16 m*s-2) 53 3014 (2944–3084) 253 (212–313) 8.4
Setting #4 (3.63 m*s-2) 53 7967 (7796–8138) 620 (521–768) 7.8
  1. (N equals numbers of instruments)