Elevated Serum Levels of Homocysteine as an Early Prognostic Factor of Psychiatric Disorders in Children and Adolescents

Table 3

Correlation (𝑟) of Hcy concentration between control group and psychiatric disorder groups.

Diagnosis	Control group
	Pearson’s correlation	t test
Schizophrenia spectrum disorders	−.46	<0.01
Paranoid schizophrenia, continuous	−.58	<0.01
Paranoid schizophrenia, episodic with residual symptoms	−.56	<0.01
Simple schizophrenia	−.19	<0.01
Patients with mood disorders	−.45	<0.01

The t-test is used to evaluate the differences in means between two groups.
Pearson correlation coefficient 𝑟, also called linear or product-moment correlation, is used to determine the extent to which values of two variables are “proportional” to each other.