Table 2.
Ranges and κ Values for CDR Sum of Boxes Scores by Global CDR Score Stage
| Global CDR Score |
|||||
|---|---|---|---|---|---|
| 0 | 0.5 | 1.0 | 2.0 | 3.0 | |
| CDR Sum of Boxes | |||||
| Range | 0 | 0.5–4.0 | 4.5–9.0 | 9.5–15.5 | 16.0–18.0 |
| AUC | NA | 0.99 | 0.97 | 0.99 | 0.97 |
| κ Valuea | 0.94 | 0.94 | 0.90 | 0.86 | 0.88 |
| Correctly classified, %b | 100.0 | 95.1 | 89.6 | 91.5 | 100.0 |
Abbreviations: AUC, area under the receiver operating characteristic curve (all were significant at P<.001); CDR, Clinical Dementia Rating; NA, not applicable.
a
Overall κ=0.90.
b
Correctly classified reflects the percentage of participants in the derived Sum of Boxes ranges who were in the appropriate global score range.