Correlations of covariates with RQ expression values in excellent lithium responders.

To try and explain the distribution abnormal of Syn2 expression in Li-responders we computed correlations between RQ values and 15 potential covariates relating to age at sampling, onset, treatment start, etc., lithium treatment, as well as family history of other psychiatric disorders. (No samples had any family history of schizophrenia.) Normality of distribution was determined using the Shapiro-Wilk normality test and correlations were determined using Pearson's or Spearman's tests accordingly. No significant correlations were found with any of these variables.