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Table 4 Construct validity of the Pedi-IKDC and KOOS-Child subscales (n = 100)

From: Pedi-IKDC or KOOS-child: which questionnaire should be used in children with knee disorders?

  Pedi-IKDC KOOS
Symptoms
KOOS
Pain
KOOS
ADL
KOOS
Sport/play
KOOS
QOL
Pedi-IKDC      
 Pearson r   0.69 0.84 0.83 0.80 0.76
 (Predefined r)   (≥ 0.5) (≥ 0.5) (≥ 0.5) (≥ 0.5) (≤ 0.35)
 Hypothesis confirmed   Yes Yes Yes Yes No
Lysholm
 Pearson r 0.71 0.70 0.71 0.66 0.56 0.57
  (Predefined r) (≥ 0.5) (≥ 0.5) (≥ 0.5) (≥ 0.5) (≥ 0.5) (≤ 0.35)
 Hypothesis confirmed Yes Yes Yes Yes Yes No
NRS Pain
 Pearson r −0.70 −0.44 −0.71 −0.62 −0.54 −0.52
  (Predefined r) (≤ −0.5) (≤ −0.5) (≤ − 0.5) (≤ − 0.5) (≤ − 0.5) (≥ − 0.35)
 Hypothesis confirmed Yes Yes Yes Yes Yes No
EQ_5D
 Pearson r 0.53 0.42 0.52 0.50 0.45 0.53
  (Predefined r) (≤ 0.35) (≤ 0.35) (≤ 0.35) (≤ 0.35) (≤ 0.35) (≥ 0.5)
 Hypothesis confirmed No No No No No Yes
Confirmed hypothesis n (%) 6/8 (75%) 3/4 (75%) 3/4 (75%) 3/4 (75%) 3/4 (75%) 1/4 (25%)
  1. All Pearson’s correlation coefficients were significant for the Pedi-IKDC and KOOS-Child subscales (p < 0.01)
  2. IKDC, The International Knee Documentation Committee Subjective Knee Form; KOOS Knee injury and Osteoarthritis Outcome Score; ADL, Activities of Daily Living; QOL, Quality Of Life; NRS, Numeric Rating Scale pain; Lysholm, Lysholm Knee Scoring Scale; EQ-5D, EuroQol-5 Dimension; Pearson r, correlation coefficient; n, number of hypothesis