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Table 3 Hypothesis testing for evaluating validity of the IKDC-SKF for the total population as well as each patient subgroup

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

  IKDC-SKF
Total ACL Meniscus Cartilage Mix
Lysholm 0.80 (≥ 0.6) 0.75 (≥ 0.6) 0.79 (≥ 0.6) 0.81 (≥ 0.6) 0.8 (≥ 0.6)
Tegner 0.34 (0.1–0.49) 0.39 (0.1–0.49) 0.37 (0.1–0.49) 0.42 (0.1–0.49) 0.25 (0.1–0.49)
PCS-12 0.70 (≥ 0.6) 0.71 (≥ 0.6) 0.67(≥ 0.6) 0.68 (≥ 0.6) 0.72 (≥ 0.6)
MCS-12 0.17 (0.1–0.29) 0.13 (0.1–0.29) 0.23 (0.1–0.29) 0.30 (0.1–0.29) 0.09 (0.1–0.29)
  1. Correlation estimates in parentheses indicate a priori formulated hypotheses
  2. Correlation estimates in bold indicate confirmed hypotheses
  3. IKDC-SKF = International Knee Documentation Committee Subjective Knee Form, Lysholm = Lysholm Score, Tegner = Tegner Activity Scale, PCS-12 = 12-item short-form health survey (SF-12) physical component summary scale, MCS-12 = 12-item short-form health survey (SF-12) mental component summary scale, 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)