Table 3 Results of distribution and anchor based approaches (N = 46)
| Â | 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 |