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Table 1 Median and quartiles of COP parameters for both groups and the corresponding Mann-Whitney U independent tests used to compare differences between students and athletes

From: Postural control in top-level female volleyball players

  Group N Median Quartiles W statistic p r effect size
AP
 SD students 31 3.64 2.90–4.29 365.0 0.105 −0.207
athletes 31 3.12 2.63–3.78
 RA students 31 20.18 16.05–23.83 199.5 < .001 −0.503
athletes 31 15.51 12.81–17.03
 MV students 31 6.71 5.29–8.99 450.0 0.673 −0.055
athletes 31 6.51 5.96–7.63
 CF students 31 0.30 0.22–0.40 377.0 0.150 0.177
athletes 31 0.35 0.30–0.41
 FD students 31 1.46 1.37–1.57 246.5 0.001 0.422
athletes 31 1.56 1.52–1.64
 PF students 31 0.56 0.52–0.67 407.0 0.304 0.131
athletes 31 0.61 0.54–0.70
ML
 SD students 31 2.88 2.15–3.43 361.0 0.094 −0.213
athletes 31 2.43 1.92–3.08
 RA students 31 16.06 13.10–21-05 250.5 0.001 −0.413
athletes 31 11.85 9.30–15.77
 MV students 31 6.77 5.27–7.53 407.0 0.306 −0.131
athletes 31 6.41 4.80–7.17
 CF students 31 0.39 0.32–0.47 450.0 0.672 0.058
athletes 31 0.40 0.36–0.43
 FD students 31 1.52 1.46–1.59 248.5 0.001 0.419
athletes 31 1.64 1.56–1.67
 PF students 31 0.68 0.59–0.76 286.0 0.006 0.345
athletes 31 0.78 0.67–0.90
  1. SD Standard deviation of COP, RA A range of COP, MV Mean speed of COP, CF COP frequency, FD Fractal dimension, PF Peak frequency of COP-COM, AP Anterior-posterior plane, ML Medial-lateral plane, N Number of participants, W statistic of Mann-Whitney U independent test, r effect size - Z value from the test divided by the total number of observations