P300 latency as an indicator of severity in major depressive disorder.

Table 2 shows that there was a highly significant difference in the mean of P300 latency between mild and severe ( P < 0.0001), mild and very severe ( P < 0.0003), moderate and severe ( P < 0.0001), moderate and very severe ( P < 0.001), and between severe and very severe ( P < 0.01) level of depression.

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