Table 5.
Summary of PU-QOL traditional psychometric analysis, field test 2
| 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 r1 | PU-QOL HRQL item r1 (n) | Gender R2 (n) | Age r2 (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) |
IIC inter-item correlation; ^Range item-total correlation (ITC); 1Spearman correlation; 2Pearson correlation; aCorrelations falling outside of the predicted range; bCorrelations consistent with predictions.