Table 2 Mean (SD) clock drawing scores as function of Clinical Dementia Rating (CDR), using six scoring systems

Scoring system (maximum score)CDRF
0: normal, n = 150.5: very mild, n = 251: mild, n = 212/3: moderate/severe, n = 14
F values are from one-way analyses of variance comparing the four CDR groups, with 3 and 71 df (all p < 0.0001). Tukey honestly significant difference comparisons revealed the same pattern of mean differences for all six scoring systems: The CDR-0 and 0.5 groups differed from the CDR-1 and 2/3 groups (p < 0.05); differences between the CDR-0 and 0.5 groups and between the CDR-1 and 2/3 groups were not significant.
AD Cooperative Study (5)4.2 (0.9)3.6 (1.3)1.9 (1.2)1.0 (0.6)30.75
Pfizer Eisai (4)3.5 (0.6)2.9 (1.0)1.7 (1.1)1.1 (0.7)23.61
Mendez (20)18.2 (2.3)16.3 (4.0)9.2 (6.9)5.4 (4.9)24.58
Manos (10)8.4 (2.4)6.9 (3.1)3.1 (3.2)1.5 (2.3)20.99
Rouleau (10)8.0 (1.9)7.0 (2.3)3.3 (2.5)2.0 (1.5)30.57
Sunderland (10)8.4 (1.6)7.6 (2.4)4.1 (2.7)2.6 (1.1)27.27