Physical Therapy Korea
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Fit statistics of the KIDSCREEN questionnaire in descending order of difficulty

Items Difficulty (logits) Infit MnSqa ZSTD Outfit MnSq ZSTD
Concentration/learning (PARENT 10) 1.07 0.51 –1.03 0.75 –0.35
Autonomy (PARENT 5) 0.77 0.63 –0.65 1.05 0.28
Autonomy (CHILD 5) 0.61 2.25 1.95 1.79 1.34
Home life (PARENT 6) 0.61 0.65 –0.59 0.64 –0.56
Home life (CHILD 6) 0.44 2.20 1.88 1.48 0.91
Concentration/learning (CHILD 10) 0.44 1.33 0.74 1.25 0.60
Self-perception (PARENT 4) 0.26 3.76 3.30 5.22 3.87
Peers/social support (PARENT 8) 0.26 0.58 –0.75 0.42 –1.06
School environment (PARENT 9) 0.26 0.28 –1.75 0.29 –1.46
Physical well-being (CHILD 1) 0.06 0.13 –2.50 0.17 –1.87
Psychological well-being (CHILD 2) 0.06 0.27 –1.78 0.26 –1.50
Parent relation (CHILD 7) 0.06 0.81 –0.19 0.84 –0.05
Parent relation (PARENT 7) 0.06 0.38 –1.34 0.38 –1.10
Peers/social support (CHILD 8) –0.40 0.80 –0.14 0.54 –0.51
School environment (CHILD 9) –0.40 0.85 –0.04 0.68 –0.25
Psychological well-being (PARENT 2) –0.40 0.24 –1.63 0.27 –1.19
Physical well-being (PARENT 1) –0.70 0.46 –0.79 0.40 –0.67
Mood/emotions (PARENT 3) –0.70 3.01 2.21 5.93 3.22
Mood/emotions (CHILD 3) –2.35 0.45 –0.33 0.18 –0.45
Self-perception (CHILD 4) –3.63 Minimum measureb

MnSq, mean squares; ZSTD, Z score standardized; PARENT, parent proxy report item; CHILD, child self-report item. aStandardized residuals. bFit statistics/ZSTDs are too small to estimate.

Phys. Ther. Korea 2021;28:146~153 https://doi.org/10.12674/ptk.2021.28.2.146
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