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Table 1 Descriptive data of CoP-based variables and characterization of the random error distribution

From: Between-day reliability of centre of pressure measures for balance assessment in hemiplegic stroke patients

CoP-based variables EO/EC Session 1 Session 2 d(95% CI) r P-values
   Mean ± SD Mean ± SD    
VEL (mm.s-1) EO 14.8 ± 5.2 15.0 ± 6.7 0.1 (-1.2 to 1.5) 0.15 0.54
  EC 21.3 ± 11.3 21.4 ± 13.4 0.1 (-2.0 to 2.2) 0.34 0.15
SDVEL (mm.s-1) EO 37.7 ± 12.3 37.8 ± 13.5 0.1 (-2.6 to 2.9) 0.10 0.66
  EC 38.1 ± 11.6 38.1 ± 12.8 0.0 (-2.7 to 2.7) 0.25 0.29
VELML (mm.s-1) EO 7.6 ± 3.1 7.6 ± 4.0 0.0 (-0.8 to 0.8) 0.27 0.26
  EC 10.7 ± 5.8 10.6 ± 7.0 -0.1 (-1.3 to 1.1) 0.32 0.17
VELAP (mm.s-1) EO 10.1 ± 3.7 10.3 ± 4.7 0.3 (-0.8 to 1.4) 0.21 0.38
  EC 15.1 ± 8.6 14.8 ± 8.4 -0.3 (-2.0 to 1.3) 0.40 0.08
CEAREA (mm2) EO 438.3 ± 229.2 449.5 ± 377.8 11.2 (-188.6 to 140.9) 0.52 0.02*
  EC 558.6 ± 324.0 541.2 ± 431.5 -17.4 (-115.5 to 80.7) 0.56 0.01*
CoPML (mm) EO 10.7 ± 9.9 13.8 ± 9.6 3.1 (-0.8 to 7.0) 0.05 0.82
  EC 14.1 ± 11.6 14.7 ± 9.9 0.5 (-4.3 to 5.3) 0.03 0.92
  1. For each of the six CoP-based variables, mean ± standard deviation in session 1 and 2, and mean difference between the 2 test sessions (d) with its 95% confidence interval (95% CI) are reported in eyes open (EO) and eyes closed (EC) conditions. The detection of a possible heteroscedasticity of the random error distribution was done with calculation of Pearson’s correlation coefficient (r) between absolute individual test-retest differences and individual means of the two sessions. Significant p-values (p < 0.05) are indicated with an asterisk.