| TBI Subjects | Digit span Backward | Graduated score (Digit Span Test WAIS) | 
| TBI 1 | 4 | 6* | 
| TBI 2 | 4 | 9* | 
| TBI 3 | 5 | 11 | 
| TBI 4 | 2 | 3* | 
| TBI 5 | 3 | 6* | 
| TBI 6 | 5 | 10 | 
| TBI 7 | 3 | 4* | 
| TBI 8 | 3 | 6* | 
| TBI 9 | 3 | 4* | 
| TBI 10 | 4 | 10 | 
| TBI 11 | 2 | 2* | 
| TBI 12 | 2 | 2* | 
| TBI 13 | 4 | 7* | 
| TBI 14 | 3 | 6* | 
| TBI 15 | 6 | 14 | 
| TBI 16 | 5 | 12 |