Table 2.

Correlations between mean amplitudes of averaged filtered theta response and clinical variables

	Frontal	Central	Temporal	Temporo-parietal	Parietal	Occipital
Simple stimulus
4–6 Hz
Age	−0.49*	−0.70¥	−0.50*	−0.60¥	−0.55¥	−0.43*
Age at disease onset	−0.40	−0.52*	−0.13	−0.36	−0.55¥	−0.49*
6–8 Hz
Age	−0.33	−0.58¥	−0.40	−0.42	−0.40	−0.42
Age at disease onset	−0.28	−0.38	−0.05	−0.17	−0.43*	−0.33
Target stimulus
4–6 Hz
Age	−0.53*	−0.53*	−0.51*	−0.39	−0.53*	−0.35
Age at disease onset	−0.26	−0.30	−0.21	−0.22	−0.40	−0.13
6–8 Hz
Age	−0.23	−0.50*	−0.42*	−0.50*	−0.43*	−0.38
Age at disease onset	−0.17	−0.47*	−0.23	−0.30	−0.47*	−0.25
Non-target stimulus
4–6 Hz
Age	−0.36	−0.48*	−0.48*	−0.57¥	−0.54¥	−0.50*
Age at disease onset	−0.43*	−0.52*	−0.18	−0.44*	−0.61¥	−0.29
6–8 Hz
Age	−0.16	−0.28	−0.35	−0.48*	−0.43*	−0.41
Age at disease onset	−0.16	−0.29	−0.17	−0.25	−0.38	−0.22

Significant correlations are marked with bold characters

Spearman’s correlation test; r values. *p < 0.05; ^¥p < 0.001. Education, age at disease onset, duration of euthymia, total numbers of episodes, total numbers of manic and depressive episodes did not show any correlation