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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