Variable | Placebo | Tyrosine | p value | p value age |
---|---|---|---|---|
Story immediate recall (points) | 9.5 (0.6) | 10.2 (0.7) | 0.3 | 0.68 |
Story delayed recall (points) | 9.0 (0.6) | 9.2 (0.6) | 0.8 | 0.47 |
Digit span forward (points) | 7.5 (0.4) | 7.21 (0.4) | 0.14 | 0.75 |
Digit span backward (points) | 6.1 (0.4) | 6.25 (0.5) | 0.84 | 0.93 |
Stroop effect (s) | 81.4 (11.1) | 95.88 (12.5) | 0.18 | 0.38 |
Stroop effect (errors) | .7 (0.2) | 1.32 (0.3) | 0.14 | 0.43 |
Verbal fluency DAT (items) | 45.26 (2.3) | 44.13 (2.3) | 0.8 | 0.09 |
Block completion | 92.23 (7.83) | 83.42 (4.17) | 0.36 | 0.84 |
Letter cancellation | 249.29 (7.07) | 250.17 (7.39) | 0.61 | 0.35 |
Data represent mean (SEM). The first column with p values reflect the outcome of the paired t tests between tyrosine and placebo on the behavioral measure, the second column with p values reflects the interaction between tyrosine’s effect on the behavioral measure and age.