Table 1. Brain-derived neurotrophic factor (BDNF) levels in the two subgroups divided according to illness severity (mild vs moderate or severe), history of suicide attempts (no vs yes), and loudness dependence of auditory evoked potentials (LDAEP) values (dichotomized at the median into low vs high).

Division criteria	BDNF (ng/ml) (n = 51)		p
Severity (mild vs moderate or severe)	22.44±9.8 (n = 35)	23.94±7.38 (n = 16)	0.59
History of suicidal attempts (no vs yes)	21.93±24.71 (n = 33)	24.71±7.7 (n = 18)	0.3
LDAEP values (low vs high)	21.54±9.45 (n = 26)	24.34±8.6 (n = 25)	0.27

Data are mean±SD values.