The mean NSE level in the group of patients with schizophrenia was 9.5 ng/ml (quartile range 8.1- 10.6 ng/ml) and was statistically significantly lower than the mean NSE concentration in the control group (11.7 ng/ml; quartile range 10.2-13.0 ng/ml) (p<0.0001) (Figure 1). Here, ENO2 is linked to schizophrenia.