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Table 5 Summary of PU-QOL traditional psychometric 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) Internal consistency Cronbach’s alpha IIC Scaling assumptions-corrected ITC Test retest reproducibility Convergent validity Discriminant validity
ICC consistency ICC absolute Correlation Related SF12 scale r 1 PU-QOL HRQL item r 1(n) Gender R 2(n) Age r 2(n)
Pain (8) 0.89 0.24 – 0.66^ 0.53 – 0.70^ 0.80 0.81 0.80  0.48b  0.38b (206)  0.13b (214)  0.11b (214)
Exudate (8) 0.91 0.32 – 0.72^ 0.51 – 0.75^ 0.62 0.63 0.62  n/a  0.25a (216)  0.08b (225)  -0.14b (224)
Odour (6) 0.97 0.72 – 0.93^ 0.79 – 0.94^ 0.68 0.68 0.70  n/a  0.20a (217)  0.05b (228)  -0.14b (227)
Sleep (6) 0.92 0.49 – 0.81^ 0.68 – 0.85^ 0.82 0.82 0.82  n/a  0.32b (171)  0.21b (178)  0.10b (178)
Vitality (6) 0.90 0.49 – 0.90^ 0.63 – 0.90^ 0.74 0.74 0.74  0.36b  0.52b (135)  0.03b (137)  -0.16b (137)
Movement/Mobility (9) 0.93 0.23 – 0.91^ 0.67 – 0.80^ 0.87 0.86 0.88 -0.50b  0.39b (37)  0.04b (39)  0.22b (39)
ADL (8) 0.95 0.41 – 0.90^ 0.58 – 0.90^ 0.87 0.87 0.87 -0.38b  0.35b (48)  -0.05b (49)  -0.19b (49)
Emotional well-being (15) 0.94 0.24 – 0.79^ 0.54 – 0.76^ 0.83 0.82 0.83 -0.44b  0.58b (133)  0.16b (135)  -0.15b (135)
Appearance & self-consciousness (7) 0.89 0.37 – 0.79^ 0.62 – 0.76^ 0.81 0.81 0.81 -0.40b  0.50b (176)  0.23b (179)  -0.03b (178)
Participation (9) 0.93 0.36 – 0.88^ 0.60 – 0.86^ 0.63 0.64 0.63 -0.52b  0.51b (75)  0.01b (76)  -0.29b (76)
  1. IIC inter-item correlation; ^Range item-total correlation (ITC); 1Spearman correlation; 2Pearson correlation; aCorrelations falling outside of the predicted range; bCorrelations consistent with predictions.