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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.