Table 3.
Results of distribution and anchor based approaches (N = 46)
| Number | Percent | |
|---|---|---|
| Distribution-based approach (N = 40) | ||
| Distribution-reported | ||
| 0.2 SD at baseline | 12 | 30 |
| 0.3 SD at baseline | 25 | 62.5 |
| 0.5 SD at baseline | 36 | 90 |
| SEM at baseline | 31 | 77.5 |
| 0.2 SD at follow-up | 7 | 17.5 |
| 0.3 SD at follow-up | 14 | 35 |
| 0.5 SD at follow-up | 14 | 35 |
| SEM at follow-up | 13 | 32.5 |
| 0.2 SD of change | 2 | 5 |
| 0.3 SD of change | 8 | 20 |
| 0.5 SD of change | 7 | 17.5 |
| SEM of change | 5 | 12.5 |
| Anchor-based approach (N = 43) | ||
| Study design | ||
| Cross-sectional | 3 | 7.1 |
| Longitudinal design | 39 | 92.9 |
| Number of anchors | ||
| 1 | 23 | 53.5 |
| 2 | 8 | 18.6 |
| 3 | 3 | 7 |
| 4 | 3 | 7 |
| ≥ 5 | 6 | 13.9 |
| Anchors | ||
| Overall rating of change | 9 | 20.93 |
| Anchor derived from an external questionnaire | 13 | 30.2 |
| Anchor derived from one dimension of the questionnaire studied | 8 | 18.6 |
| Performance status | 15 | 34.9 |
| MMSE | 1 | 2.3 |
| Weight loss | 1 | 2.3 |
| Other | 10 | 23.3 |
| Correlation checked between anchor and the studied questionnaire | ||
| Yes | 32 | 76.2 |
| No | 9 | 21.4 |
| Criteria used to detect a moderate correlation (N = 32) | ||
| ≥ 0.3 | 15 | 46.9 |
| ≥ 0.4 | 1 | 3.1 |
| ≥ 0.5 | 1 | 3.1 |
| Not reported | 15 | 46.9 |
| Minimum N by anchor category | ||
| ≤ 20 | 16 | 37.2 |
| > 20 | 18 | 41.9 |
| Not reported | 9 | 20.9 |
SD standard deviation, SEM standard error of measurement, MMSE mini mental state examination