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Table 7 Assessment of each strength measure for acceptable agreement (n = 20)

From: A clinical test to assess isometric cervical strength in chronic whiplash associated disorder (WAD): a reliability study

 

Mean score

Difference Scores

 

Difference Scores as % of Mean Score

Mean

St. Dev

95% Limits

 

% of Mean

95% Limits

Lower

Upper

A priori std

Lower

Upper

Intra rater

Flex

3.04

0.415

1.094

-1.73

2.56

5.17a

13.65

-56.89

84.19

Ext

6.26

-0.185

2.597

-5.27

4.90

5.64

-2.96

-84.26

78.35

RSF

3.56

0.615

1.328

-1.99

3.22

4.08

17.28

-55.84

90.39

LSF

4.24

0.460

2.552

-4.54

5.46

3.38

10.85

-107.11

128.80

RR

2.92

0.125

1.017

-1.87

2.12

3.57

4.28

-63.99

72.56

LR

3.02

-0.160

1.289

-2.69

2.37

4.29

-5.30

-88.93

78.33

Total

23.04

1.270

6.504

-11.48

14.02

26.13a

5.51

-49.82

60.84

Inter rater

Flex

3.10

-0.545

1.255

-3.00

1.91

3.13

-17.58

-96.93

61.77

Ext

6.62

-1.815

2.331

-6.38

2.75

4.72

-27.42

-96.42

41.59

RSF

3.65

-0.690

1.218

-3.08

1.70

3.65

-18.90

-84.32

46.51

LSF

4.09

-0.185

2.187

-4.47

4.10

3.07

-4.52

-109.32

100.28

RR

3.05

-0.870

0.894

-2.62

0.88

2.66

-28.52

-85.97

28.92

LR

3.25

-0.360

1.229

-2.77

2.05

3.17

-11.08

-85.21

63.05

Total

23.75

-4.465

5.962

-16.15

7.22

20.40

-18.80

-68.00

30.40

  1. Mean score mean strength score, mean mean difference score between two measures (measure 1—measure2), St. Dev standard deviation of difference scores, A priori std previously reported MDC values for each strength measure, used as threshold to assess for agreement; % mean mean difference score as percentage of mean strength score, Flex Flexion, Ext Extension, RSF Right side flexion, LSF Left side flexion, RR Right rotation, LR Left rotation, Total sum of all directional strength values
  2. a Acceptable agreement observed if breadth of 95% limits of agreement less than a priori std
  3. All strength values expressed in kgf