The trend also suggests a change in the way many professional men view themselves, the researchers reckon.

研究者认为，这种趋势同样也表明很多职业男性看待自己的方式也发生了变化。

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These include men who worked as professional officers of the law, and others who were criminals.

VOA: special.2010.03.17

Avoid professional men because they more frequently work in an environment that includes women.

FORBES: Readers Say

Vicky Oliver, author of "Bad Bosses, Crazy Coworkers and Other Office Idiots, " says she sees the differences in how people perceive professional men and women.

CNN: Gender perceptions at work

Although there was a significant difference in life expectancy depending on social class, with professional men living to 77 and unskilled manual labourers on average living to just under 69.

BBC: Depressed man