Table 2.

Concentration of homocysteine thiolactone, cysteine, and cysteinylglycine in the urine of autistic children (ASD) and non-autistic children (non-ASD) (M ± SD) (μmol/mmol of creatinine).

Name of Compound	ASD	non-ASD	ASD vs non-ASD
Homocysteine thiolactone	10.30 ± 2.13	7.90 ± 2.4×10−3	Z = −5.42, p = 5.86×10−8
Cysteine	36.89 ± 3.00	12.34 ± 0.52	Z = −6.41, p = 1.49×10−10
Cysteinylglycine	1.02 ± 0.07	0.27 ± 0.04	Z = −5.72, p = 1.06×10−8