Table 2.
Test-retest reliability and internal consistency of the total scores
| Domain | Test 1 | Test 2 | ICC* | 95% CI | Cronbach’s alpha |
|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | ||||
| Symptom (3 items)/25 points | 5.41 (4.38) | 5.92 (4.00) | 0.85 | 0.78–0.89 | 0.92 |
| Satisfaction (5 items)/40 points | 12.10 (6.90) | 12.88 (7.52) | 0.81 | 0.73–0.86 | 0.89 |
| Expectation (3 items)/15 points | 12.89 (2.19) | 13.03 (2.20) | 0.80 | 0.73–0.86 | 0.89 |
| Total functional activity (19 items)/100 points | 30.80 (16.91) | 29.92 (17.15) | 0.81 | 0.74–0.87 | 0.90 |
| Functional activity (5 items)/30 points | 13.35 (8.69) | 11.59 (9.13) | 0.71 | 0.61–0.79 | 0.84 |
| Standard activity (6 items)/30 points | 9.54 (5.46) | 9.54 (5.81) | 0.84 | 0.78–0.89 | 0.91 |
| Advanced activity (5 items)/25 points | 3.29 (3.75) | 3.33 (3.93) | 0.83 | 0.77–0.88 | 0.91 |
| Discretionary activity (3 items)/15 points | 4.62 (4.22) | 5.46 (4.12) | 0.69 | 0.58–0.78 | 0.83 |
| Total score/180 points | 61.20 (24.18) | 62.45 (24.22) | 0.86 | 0.81–0.90 | 0.93 |
*Mixed effects ANOVA model with absolute agreement (single measure); ICC = intraclass correlation coefficient.