Table 1.

The characteristics (age in years, weight in kg) of the different study groups with regard to their distribution over three groups that received acute tryptophan depletion (ATD, to decrease central nervous system serotonin synthesis), phenylalanine–tyrosine depletion (PTD, to decrease central nervous system dopamine synthesis), or a balanced amino acid load (BAL, which served as a control condition)

	Age (years±SD)	Weight (kg±SD)
ATD	24.38±4.13	71.22±13.54
PTD	23.59±3.12	70.41±11.65
BAL	26.24±5.86	74.68±17.86

Data are presented as the mean±standard deviation.