Table 1.

Cu/Zn SOD plasma levels in depressed individuals are significantly higher than in normal controls.

	Depression	Normal controls
Mean	0.695	0.326
SD	0.479	0.149
SEM	0.080	0.035
N	36	18

Note: The two-tailed P value equals 0.0025. t = 3.1769; df = 52; standard error of difference = 0.116.