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Table 2 IKDC-SKF reliability and minimal important change

From: Measurement properties of the German version of the IKDC subjective knee form (IKDC-SKF)

  IKDC-SKF
Total ACL Meniscus Cartilage Mix
Cronbach’s Alphaa (95% CI) 0.87 (0.85; 0.89) 0.84 (0.76; 0.92) 0.89 (0.86; 0.92) 0.87 (0.83; 0.91) 0.87 (0.84; 0.90)
ICCb (95% CI) 0.94 (0.91; 0.95) 0.93 (0.86; 0.96) 0.93 (0.89; 0.96) 0.92 (0.85; 0.96) 0.93 (0.88; 0.96)
SEMb 5.4 4.4 5.6 6.0 5.5
SDCb 14.9 12.3 15.6 16.7 15.3
MICc 6.7 −1.3 11.3 12.5 12.5
  1. ICC = intraclass correlation coefficient, CI = confidence interval, SEM = standard error of measurement, SDC = smallest detectable change, MIC = minimal important change, IKDC-SKF = International Knee Documentation Committee Subjective Knee Form, Total = all eligible study patients, ACL = anterior cruciate ligament surgery patients only, Meniscus = meniscal surgery patients only, Cartilage = articular cartilage surgery only, Mix = patients from a combination of the three surgery types (mixed surgery subgroup)
  2. aSample sizes for Cronbach’s alpha calculations are equivalent to baseline data “n” in Fig. 2
  3. bSample sizes for ICC, SEM and SDC calculations are equivalent to reliability data “n” in Fig. 2
  4. cSample sizes for the MIC calculation are equivalent to baseline & 6-month follow-up data “n” in Fig. 2