Distribution of the rating of MTA in the study groups AD, OD, and ND (left/right)
| Score/diagnosis | 0 | 1 | 2 | 3 | 4 | Total |
| AD | 2/2 | 14/13 | 12/13 | 10/8 | 2/3 | 40 |
| OD | 4/4 | 8/8 | 13/13 | 6/7 | 3/2 | 34 |
| ND | 23/23 | 29/29 | 4/4 | 0/0 | 0/0 | 56 |
| 130 |
AD=Alzheimer's disease; OD=other dementias (see text); ND=non-demented subjects.χ2 test: ADv ND p<0.0001 (left and right); ADv OD p>0.05 (left and right); ODv ND p<0.0001 (left and right). Thirteen scans could not be rated for technical reasons.