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Table 2 Agreement between outputs from AM7164, GT1M and GT3X+ in mcpm and time spent at different intensities (minutes/day) (n = 16)

From: Comparison of three generations of ActiGraph activity monitors under free-living conditions: do they provide comparable assessments of overall physical activity in 9-year old children?

  Mean difference in %* (95% CI) Effect size** ICC (95% CI)
Total physical activity (mcpm)
Model 7164 – GT1M 11.7 (-4.0, 27.4) 0.32 .961 (0.368, 0.991)
Model 7164 - GT3X+ 9.4 (-4.9, 23.7) 0.10 .977 (0.387, 0.995)
GT1M - GT3X+ 2.1 (-4.9, 9.1) 0.06 .995 (0.984, 0.998)
Sedentary time < 100 cpm
Model 7164 – GT1M -5.9 (-17.4, 5.6) 0.37 .951 (0.189, 0.989)
Model 7164 - GT3X+ -5.6 (-16.7, 5.7) 0.35 .956 (0.289, 0.990)
GT1M - GT3X+ -0.3 (-3.0, 2.4) 0.02 .994 (0.982, 0.998)
Light activity 100 < 2000 cpm
Model 7164 – GT1M 12.4 (-3.7, 28.5) 0.61 .880 (-0.105, 0.973)
Model 7164 - GT3X+ 12.0 (-3.9, 27.9) 0.61 .865 (-0.060, 0.968)
GT1M - GT3X+ 0.4 (-2.7, 3.5) 0.02 .993 (0.982, 0.998)
Moderate activity 2000 < 6000 cpm
Model 7164 – GT1M 3.0 (-5.3, 11.4) 0.08 .979 (0.943, 0.993)
Model 7164 - GT3X+ -0.3 (-3.0, 2.4) 0.01 .989 (0.967, 0.996)
GT1M - GT3X+ 3.3 (-5.5, 12.1) 0.01 .990 (0.971, 0.997)
Vigorous activity ≥ 6000 cpm
Model 7164 – GT1M 46.6 (22.2, 71.0) 0.64 .876 (-0.133, 0.973)
Model 7164 - GT3X+ 40.5 (16.4, 64.6) 0.57 .893 (-0.067, 0.976)
GT1M - GT3X+ 4.3 (-5.6, 14.2) 0.06 .991 (0.973, 0.997)
MVPA ≥ 2000 cpm
Model 7164 – GT1M 9.3 (-4.9, 23.5) 0.24 .968 (0.799, 0.991)
Model 7164 - GT3X+ 5.6 (-5.7, 16.9) 0.15 .985 (0.929, 0.996)
GT1M - GT3X+ 3.5 (-5.5, 12.5) 0.09 .991 (0.970, 0.997)
  1. All correlations are significant at the 0.001 level. Mcpm: mean counts per minute, MVPA: moderate to vigorous physical activity. *Mean differences in percent are calculated based on the summed mean values. **Effect sizes are calculated based on pooled standard deviations.