Table 2. Unadjusted and adjusted geometric mean differences in Phenylalanine, Tyrosine and Phenylalanine:Tyrosine ratio for schizophrenia patients vs. healthy controls (reference group is the healthy controls).

	Geometric meana differences	95% CI	p-value
Unadjusted
Phenylalanine	1.26 µmol/L	1.18 to 1.36	<0.0001
Tyrosine	0.98 µmol/L	0.91 to 1.05	0.596
Phenylalanine:Tyrosine ratio	1.41	1.33 to 1.48	<0.0001
Adjustedb
Phenylalanine	1.19 µmol/L	1.08 to 1.30	<0.0001
Tyrosine	0.98 µmol/L	0.91 to 1.07	0.668
Phenylalanine:Tyrosine ratio	1.30	1.22 to 1.39	<0.0001

^aBased on back-transformed means of log transformed values.

^bAdjusted for gender, age, education and body mass index (BMI).