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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