He was suffering from a "depressive episode" at the time of the attack, the court heard.

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Mr Denney said the psychiatrists who assessed the defendant "were of one voice" that he had suffered a depressive episode.

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The World Health organisation estimates six per cent of men and almost 10 per cent of women suffer a depressive episode every year.

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Research suggests that being unemployed doubles a person's chance of a major depressive episode and that unemployment is also highly associated with domestic violence and alcohol abuse, Leahy said.

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Studies suggest that most cases of bipolar disorder start with depressive episodes and that many young people who develop severe depression will eventually go on to have a manic episode.

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