Table 1 Descriptives and ANOVA results for all measures
From: Effects of acute tryptophan depletion on executive function in healthy male volunteers
|  | ATD | Placebo | ANOVA results †| ||||
|---|---|---|---|---|---|---|---|
|  | Mean | (SD) | Mean | (SD) | Drink | Order | Drink × Order |
WCST a | Â | Â | Â | Â | Â | Â | Â |
Categories completed | 5.5 | (1.4) | 5.7 | (0.8) | F = 0.019, P = 0.893 | F = 0.019, P = 0.893 | F = 3.161, P = 0.099 |
Trials to complete 1st category | 12.0 | (4.9) | 13.6 | (4.6) | F = 0.996, P = 0.336 | F = 0.002, P = 0.966 | F = 0.183, P = 0.676 |
Perseverative errors (%) | 9.2 | (4.4) | 9.1 | (3.2) | F = 0.112, P = 0.744 | F = 1.457, P = 0.249 | F = 4.712, P = 0.049 * |
Non-perseverative errors (%) | 9.8 | (7.3) | 8.3 | (4.4) | F = 0.012, P = 0.887 | F = 0.549, P = 0.472 | F = 12.531, P = 0.004 *** |
Conceptual level responses (%) | 76.8 | (16.1) | 79.5 | (9.7) | F = 0.004, P = 0.949 | F = 0.902, P = 0.359 | F = 7.947, P = 0.014 * |
Verbal fluency | Â | Â | Â | Â | Â | Â | Â |
Correct | 43.2 | (9.2) | 44.2 | (9.4) | F = 0.166, P = 0.690 | F = 6.098, P = 0.028 * | F = 0.432, P = 0.522 |
Stroop | Â | Â | Â | Â | Â | Â | Â |
C (latency; seconds) | 54.1 | (5.5) | 54.1 | (8.9) | F = 0.006, P = 0.940 | F = 0.007, P = 0.934 | F = 0.149, P = 0.706 |
CW (latency; seconds) | 114.0 | (16.7) | 112.7 | (14.8) | F = 0.049, P = 0.828 | F = 0.079, P = 0.783 | F = 11.560, P = 0.005 *** |
Interference (CW – C) | 59.9 | (16.9) | 58.7 | (15.3) | F = 0.022, P = 0.883 | F = 0.056, P = 0.816 | F = 7.615, P = 0.016 * |
Trail Making | Â | Â | Â | Â | Â | Â | Â |
Trails A (seconds) | 23.3 | (5.0) | 25.3 | (6.5) | F = 6.232, P = 0.027 * | F = 0.021, P = 0.886 | F = 8.680, P = 0.011 * |
Trails B (seconds) | 49.9 | (10.4) | 48.4 | (9.4) | F = 0.109, P = 0.746 | F = 3.272, P = 0.094 | F = 1.999, P = 0.181 |
Shift index (Trails B – A) | 26.7 | (11.0) | 23.1 | (7.4) | F = 1.601, P = 0.228 | F = 4.829, P = 0.047 * | F = 0.008, P = 0.928 |
VAS mood scale | Â | Â | Â | Â | Â | Â | Â |
Alertness | 74.0 | (14.0) | 71.4 | (16.2) | F = 0.595, P = 0.454 | F = 0.905, P = 0.359 | F = 3.838, P = 0.072 |
Contentedness | 83.4 | (7.5) | 86.5 | (7.8) | F = 2.372, P = 0.147 | F = 1.922, P = 0.189 | F = 1.298, P = 0.275 |
Calmness | 82.8 | (12.2) | 81.6 | (16.4) | F = 0.014, P = 0.908 | F = 0.854, P = 0.372 | F = 0.570, P = 0.464 |