Figure 5.
Significant correlations of 5-hydroxyindoleacetic acid (5HIAA) to tryptophan (Trp), melatonin (Mel), Kynurenine (Kyn) or 3-hydroxy-kynurenine (3OHKy) in normal control subjects, but not in FENNS patients at baseline and FENNS patients after 4-week treatment with antipsychotic drugs. The P values were calculated by Monte Carlo simulated probability of the statistic (good approximation for all sample sizes). FENNS, first-episode neuroleptic-naive schizophrenic; iqu, negative inverse quartic root; qurt, quartic root; ln, natural log.