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Table 4 Linear measures of centre of pressure displacement by group

From: On the use of approximate entropy and sample entropy with centre of pressure time-series

  Descriptive statistics by group Post hoc
  Young (Y) Non-Fallers (NF) Fallers (F) NF-Y F-Y F-NF
Variable Mean SD Mean SD Mean SD MD p-value MD p-value MD p-value
Total displacement (cm) 110.479 71.097 152.342 96.961 162.718 102.772 41.863 <0.001 52.239 <0.001 10.376 0.266
Standard deviation, AP (cm) 0.730 0.347 0.833 0.434 0.866 0.446 0.103 <0.001 0.136 <0.001 0.033 0.519
Standard deviation, ML (cm) 0.511 0.279 0.639 0.401 0.683 0.440 0.128 <0.001 0.172 <0.001 0.044 0.251
Amplitude, AP (cm) 4.017 2.006 4.810 2.646 5.103 2.684 0.793 <0.001 1.086 <0.001 0.293 0.247
Amplitude, ML (cm) 2.930 1.669 3.663 2.357 3.889 2.575 0.733 <0.001 0.959 <0.001 0.226 0.337
Total Mean Velocity, (cm/s) 1.841 1.185 2.539 1.616 2.712 1.713 0.698 <0.001 0.871 <0.001 0.173 0.266
Mean Velocity, AP (cm) 1.313 0.862 1.928 1.212 2.118 1.343 0.615 <0.001 0.805 <0.001 0.190 0.058
Mean Velocity, ML (cm) 1.013 0.668 1.261 0.864 1.273 0.846 0.248 <0.001 0.260 <0.001 0.012 0.981
Area (cm2) 8.270 7.481 12.71 13.015 14.25 14.326 4.440 <0.001 5.980 <0.001 1.540 0.155
  1. SD standard deviation, MD mean difference, AP anterior-posterior, ML medial-lateral
  2. Bold values indicate significant differences