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Table 1 Reliability results of single measures and means of 2, 3, 4 and 5 measures for each variable

From: The reliability of a portable clinical force plate used for the assessment of static postural control: repeated measures reliability study

Variable Mean ± SD* ICC (95% CI) SEM MDD Bias (95% CI) ± 95% LOA
Relative weight bearing on right leg (%)      
1 repetition 50.10 ± 2.7 0.44 (−0.18,0.74) 2.0 5.6 0.3(−0.3,0.9) ±6.5
2 repetitions 49.84 ± 2.4 0.65 (0.25,0.83) 1.4 3.9 0.3(−0.2,0.7) ±4.9
3 repetitions 49.69 ± 2.3 0.75 (0.47,0.88) 1.2 3.2 0.1(−0.3,0.5) ±4.1
4 repetitions 49.69 ± 2.3 0.82 (0.63,0.92) 1.0 2.7 0.2(−0.2,0.5) ±3.6
5 repetitions 49.64 ± 2.3 0.83 (0.64,0.92) 0.9 2.6 0.3(−0.1,0.6) ±3.5
Relative weight bearing on left leg (%)      
1 repetition 49.90 ± 2.7 0.44(−0.18,0.75) 2.0 5.6 0.3(−0.3,0.9) ±6.5
2 repetitions 50.16 ± 2.4 0.65 (0.27,0.85) 1.4 3.9 0.3 (−0.2,0.7) ±4.9
3 repetitions 50.31 ± 2.3 0.75 (0.49,0.89) 1.2 3.2 0.1(−0.3,0.5) ±4.1
4 repetitions 50.31 ± 2.3 0.81 (0.59-0.91) 1.0 2.7 0.1(−0.2,0.5) ± 3.7
5 repetitions 50.36 ± 2.3 0.82 (0.63-0.92) 1.0 2.7 0.2(−0.1,0.5) ±3.5
COP mean velocity (mm/sec)      
1 repetition 6.0 ± 4.8 0.19 (−0.75,0.62) 4.4 12.1 −0.6(−1.9,0.7) ±13.50
2 repetitions 5.6 ± 3.4 0.83 (0.65,0.92) 1.3 3.5 0.2(0.1,0.4)† ±1.81
3 repetitions 5.5 ±3.3 0.95 (0.90,0.98) 0.7 2 0.2(0.0,0.5) ±2.68
4 repetitions 5.5 ± 3.3 0.97 (0.94,0.99) 0.6 1.6 0.09(−0.1,0.3) ±2.09
5 repetitions 5.4 ± 3.2 0.92 (0.84,0.96) 0.9 2.5 0.03(−0.3,0.3) ±3.43
Average location of COP (mm)      
1 repetition 35.0 ± 21 0.53 (−0.01,0.78) 14.4 39.7 −1.8(−6.2,2.6) ±47.2
2 repetitions 38.4 ± 31.1 0.92 (0.84,0.96) 8.8 24.4 −1.6(−4.7,1.5) ±33.3
3 repetitions 37.3 ± 26.5 0.91 (0.81,0.96) 8 22.1 −0.4(−3.2,2.4) ±30.2
4 repetitions 38.8 ± 28.9 0.93 (0.85,0.97) 7.7 21.3 −0.7(−3.4,2.1) ±29.8
5 repetitions 39.0 ± 29.6 0.94 (0.88,0.97) 7.3 22 −0.6(−3.2,2.0) ±27.9
Sway area (mm 2 )      
1 repetition 1549.6 ± 1605.5 0.06(−1.02,0.56) 1556.9 4302.7 −265.6(−686.4,155.1) ± 4517.0
2 repetitions 1442.6 ± 1055.5 0.47 (−0.13,0.75) 763.7 2116.8 −73.2 (−302.3,156.3) ±1399.0
3 repetitions 1456.6 ± 1001.9 0.63 (0.28,0.82) 612.7 1698.3 −159.2 (−350.4,32.1) ±2054.0
4 repetitions 1440.3 ± 889.8 0.68 (0.33,0.85) 504.8 1399.2 −159.2 (−278.9,43.8) ± 1732.7
5 repetitions 1466.9 ± 918.2 0.83 (0.64,0.92) 380.4 1054.3 −48.6 (−178.7,81.7) ± 1399.0
  1. CI confidence interval, ICC intra class correlation coefficient, LOA limit of agreement, MDD minimal detectable difference, SEM standard error of measurement
  2. *Pooled from all repetitions;
  3. † Statistically significant bias (different from zero);
  4. Bold ICCs indicate acceptable reliability values.
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