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Table 3 Summary of preliminary PU-QOL instrument psychometric analysis, field test 1

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

Scale (No. of items) Rasch analysis Traditional psychometric analysis
Items with disordered thresholds Item locations logits range Fit statistics fit residuals outside +/−2.5 Items with Chi square probability significance ≥0.001 Person separation index Cronbach alpha Range IIC Scaling assumptions corrected ITC
Pain (8) 5 -0.94 − 0.80 0 4 0.78 0.89 0.24 – 0.66 0.53 – 0.70^
Exudate (8) 4 -0.51 − 0.48 0 0 0.59 0.92 0.40 – 0.86 0.56 – 0.84^
Odour (6) 2 -1.47 − 0.60 0 0 0.62 0.96 0.74 – 0.91 0.83 – 0.92^
Sleep (6) 3 -0.54 − 0.31 0 0 0.62 0.92 0.48 – 0.84 0.67 – 0.86^
Vitality (3) 0 -0.48 − 0.44 0 0 0.03 n/a n/a n/a
Movement/mobility (11) 4 -0.33 − 0.48 0 0 0.58 0.93 0.23 – 0.91 0.67 – 0.80^
ADL (9) 8 -0.54 − 0.57 0 0 0.29 0.95 0.41 – 0.90 0.58 – 0.90^
Emotional well-being (17) 4 -1.15 − 1.46 1 0 0.82 0.93 0.24 – 0.79 0.54 – 0.76^
Appearance & self- consciousness (7) 4 -0.83 − 0.65 0 0 0.56 0.90 0.41 – 0.75 0.60 – 0.79^
Participation (9) 4 -0.56 − 0.54 0 0 0.65 0.96 0.53 – 0.89 0.73 – 0.90^
  1. IIC inter-item correlation; ^Range item-total correlation (ITC).