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Table 2 ICC, SEM, and SDD values for inter- and intrarater reliability of HHD strength measures.

From: Reliability of maximal isometric knee strength testing with modified hand-held dynamometry in patients awaiting total knee arthroplasty: useful in research and individual patient settings? A reliability study

INTERRATER (n = 32)

Strength

Reliability

 

Mean (SD)

Examiner A

Mean (SD)

Examiner B

ICC (95% CI)

SEM*

SDD*

Extension

   Affected

2.73 (1.03)

2.62 (0.95)

0.96 (0.91 - 0.98)

0.21 (7.8%)

0.58 (21.7%)

   Unaffected

3.14 (1.04)

2.97 (1.08)

0.95 (0.85 - 0.98)

0.25 (8.0%)

0.68 (22.3%)

Flexion

     

   Affected

1.01 (0.43)

1.04 (0.43)

0.90 (0.81 - 0.95)

0.13 (13.1%)

0.37 (36.2%)

   Unaffected

1.04 (0.47)

1.04 (0.46)

0.94 (0.88 - 0.97)

0.11 (10.8%)

0.31 (29.8%)

INTRARATER (n = 13)

Strength

Reliability

 

Mean (SD)

Day 1

Mean (SD)

Day 2

ICC (95% CI)

SEM**

SDD**

Examiner A

Extension

   Affected

2.73 (1.03)

2.61 (1.04)

0.92 (0.74 - 0.97)

0.30 (11.3%)

0.84 (31.4%)

   Unaffected

3.14 (1.04)

2.70 (0.92)

0.94 (0.83 - 0.98)

0.24 (8.1%)

0.66 (22.4%)

Flexion

   Affected

1.01 (0.43)

0.85 (0.38)

0.76 (0.36 - 0.92)

0.19 (20.2%)

0.52 (55.9%)

   Unaffected

1.04 (0.47)

0.88 (0.35)

0.79 (0.45 - 0.93)

0.20 (20.7%)

0.55 (57.5%)

Examiner B

Extension

   Affected

2.62 (0.95)

2.49 (0.99)

0.97 (0.90 - 0.99)

0.18 (6.8%)

0.48 (19.0%)

   Unaffected

2.97 (1.08)

2.73 (1.02)

0.93 (0.69 - 0.98)

0.26 (9.3%)

0.73 (25.6%)

Flexion

   Affected

1.04 (0.43)

0.91 (0.38)

0.80 (0.47 - 0.94)

0.16 (16.0%)

0.43 (44.4%)

   Unaffected

1.04 (0.46)

0.95 (0.44)

0.90 (0.69 - 0.97)

0.14 (14.4%)

0.40 (39.8%)

  1. Mean, SD, SEM and SDD values are presented in N/kg.
  2. * Percentages of mean maximal strength measures of Examiner A and B
  3. ** Percentages of mean maximal strength measures of Day 1 and Day 2
  4. N/kg: Newtons per kilogram, SD: Standard deviation, ICC: Intraclass correlation, 95% CI: 95% Confidence interval, SEM: Standard error of measure, SDD: Smallest detectable difference, SEM = √(occasion variance + error variance), SDD = √(2)*1.96*SEM