| Grade 1 | Grade 2 | Grade 3 | Grade 4 | F | P |
CPM | 17.0 (5.1) | 20.5 (5.8) | 22.9 (4.9) | 22.7 (5.9) | 7.53 | P < .0005 |
Stroop N | 26.3 (8.0) | 26.6 (10.1) | 20.8 (5.7) | 19.6 (4.9) | 7.22 | P < .0001 |
Stroop C | 26.1 (7.2) | 23.4 (9.3) | 17.0 (3.5) | 15.3 (7.6) | 20.26 | P < .0001 |
Stroop In | 40.1 (14.3) | 50.1 (21.1) | 41.9 (10.1) | 40.4 (11.8) | 2.95 | P < .05 |
Stroop E | 13.8 (13.8) | 23.5 (19.1) | 21.1 (9.6) | 20.9 (13.1) | 2.57 | P = .057 |
Trail A | 156.6 (67.2) | 120.6 (36.3) | 108.2 (36.2) | 114.2 (38.4) | 6.50 | P < .0001 |
Trail B | 273.9 (83.2) | 236.8 (82.9) | 187.2 (54.2) | 173.7 (46.8) | 13.49 | P < .0001 |
Digit F | 3.9 (.7) | 4.1 (.8) | 4.3 (.9) | 4.4 (.7) | 2.65 | P = .052 |
Digit B | 2.3 (.5) | 2.5 (.7) | 2.6 (.6) | 2.8 (.7) | 4.16 | P < .01 |
Digit S | 6.1 (.8) | 6.7 (1.2) | 6.8 (1.2) | 7.2 (1.1) | 4.90 | P < .005 |
Symbol S | 12.8 (4.0) | 16.5 (3.9) | 17.3 (4.5) | 17.5 (6.7) | 6.60 | .001 |
HDCT | 9.9 (2.5) | 9.6 (2.3) | 10.3 (2.1) | 10.7 (2.3) | 1.27 | n.s |
Read A | 16.9 (6.1) | 22.3 (3.7) | 21.7 (4.1) | 21.9 (4.10) | 8.70 | P < .0001 |
Read F | 6.9 (7.9) | 18.6 (9.1) | 29.3 (19.3) | 26.3 (12.7) | 15.94 | P < .000 |