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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        
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        
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        
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        
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        
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
  1. degrees of freedom = 1,13 a Results confirmed non-parametrically; see main text.