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Table 2 Interobserver agreement regarding MRC score: individual muscle groupsa

From: Manual muscle strength testing of critically ill patients: feasibility and interobserver agreement

Muscle mobility

Number

Average of exams Median (IQR)

Agreement, %

Weighted kappa (95% CI) b

Intraclass correlation coefficient (2, 1) (95% CI) c

Shoulder abduction: R

28

4.5 (4 to 5)

57%

0.51 (0.32 to 0.71)

0.68 (0.43 to 0.83)

Shoulder abduction: L

27

4.5 (3.5 to 4.5)

47%

0.36 (0.12 to 0.60)

0.53 (0.21 to 0.75)

Elbow flexion: R

29

4.5 (4 to 5)

57%

0.35 (0.08 to 0.62)

0.53 (0.21 to 0.74)

Elbow flexion: L

29

4.5 (4.5 to 5)

60%

0.23 (0 to 0.55)

0.29 (0 to 0.59)

Wrist extension: R

28

5 (4.5 to 5)

80%

0.56 (0.30 to 0.82)

0.61 (0.32 to 0.79)

Wrist extension: L

30

4.5 (4.5 to 5)

73%

0.44 (0.16 to 0.73)

0.50 (0.18 to 0.72)

Hip flexion: R

26

4 (3.5 to 5)

53%

0.47 (0.25 to 0.70)

0.62 (0.33 to 0.80)

Hip flexion: L

24

4.25 (3.5 to 5)

40%

0.32 (0.11 to 0.53)

0.50 (0.17 to 0.73)

Knee extension: R

28

4.75 (4.25 to 5)

60%

0.29 (0.02 to 0.57)

0.31 (0 to 0.59)

Knee extension: L

28

4.75 (4.5 to 5)

60%

0.29 (0.02 to 0.57)

0.31 (0 to 0.59)

Foot dorsiflexion: R

26

5 (4.5 to 5)

80%

0.64 (0.43 to 0.85)

0.75 (0.54 to 0.87)

Foot dorsiflexion: L

28

5 (4.75 to 5)

40%

0.32 (0.11 to 0.53)

0.50 (0.17 to 0.73)

  1. aR, right; L, left; IQR, interquartile range; CI, confidence interval; MRC, Medical Research Council; bweighted kappa treating strength scale as ordinal linear weights; ctwo-way random effects model (raters and participants treated as random effects) intraclass correlation coefficient treating strength scale as continuous.