Table 1.

Characteristics of Study Sample

Demographic	Responders	Non-responders	F-value	p-value
Age (years)	53.81	40.44	11.85	0.002
Education (years)	14.56	16.22	2.15	0.156
Premorbid IQ	108.81	107.67	0.08	0.774
Number of antidepressant trials	5.63	6.78	0.43	0.518
Age at first major depressive episode (years)	20.31	16.44	0.56	0.461
Duration of illness (years)	32.31	24.89	1.83	0.189
MADRS baseline	36.88	37.00	0.003	0.958
BPRS positive baseline	5.25	5.89	0.276	0.604
CADSS baseline	4.44	3.11	0.193	0.664
BPRS 40 minutes	5.44	4.67	0.656	0.426
CADSS 40 minutes	8.38	9.33	0.070	0.794

The Montgomery-Asberg Depression Rating Scale (MADRS) scores range from 0 to 60 with higher scores indicating more severe symptoms.