Comparisons of ratios of product to precursor in purine pathway between healthy control subjects and FENNS patients and between FENNS patients before and after antipsychotic treatment.

* Wilcoxon rank sum test.† Wilcoxon signed ranks test.‡ Abbreviations: Gr, guanosine; G, guanine; Xan, xanthine; UA, uric acid; Xant, xanthosine; Hx, hypoxanthine.§ Mean and standard deviation. Means and standard deviations involving Xant and Gr are somewhat inaccurate due to the use of the low threshhold censoring value in place of the unknown true concentration value.¶ Significance with p