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Journal of Patient-Reported Outcomes

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
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