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Table 4 Summary of PU-QOL Rasch analysis, field test 2

From: Development and validation of a new patient-reported outcome measure for patients with pressure ulcers: the PU-QOL instrument

Scale (No. of items) Disordered thresholds Item locations logits range Fit statistics fit residuals outside +/−2.5 Items with Chi square probability significance ≥0.001 Person separation index DIF age DIF gender DIF HC setting
Uni Non Uni Non Uni Non
Pain (8) 0 -1.11 − 1.03 0 0 0.72 0 0 0 0 0 0
Exudate (8) 1 -0.75 – 0.84 1 1 0.69 0 0 0 0 0 0
Odour (6) 0 -1.31 – 0.91 0 0 0.66 0 0 0 0 0 0
Sleep (6) 0 -0.91 – 0.45 1 1 0.62 0 0 0 0 0 0
Mobility and movement (9) 2 -0.46 – 0.57 0 0 0.42 0 0 0 0 2 0
Activity (8) 4 -0.30 – 0.56 0 0 0.27 0 0 0 0 0 0
Vitality (6) 0 -0.50 – 0.81 0 0 0.38 1 0 0 0 0 0
Emotional well-being (15) 2 -1.48 – 2.44 0 0 0.86 0 0 0 0 0 0
Self-consciousness (7) 0 -1.27 – 1.02 0 0 0.58 0 0 0 0 0 0
Participation (9) 7 -0.91 – 1.00 0 0 0.57 0 0 0 0 0 0
  1. DIF differential item functioning; HC healthcare; Uni uniform DIF; Non non-uniform DIF.