科茨先生说，过去在伦敦交易大厅进行过的实验，交易员唾液中的皮质醇含量在一天内增长500%。

In past experiments conducted on a London trading floor, Mr Coates saw cortisol levels in traders' saliva jump by as much as 500% in a day.

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为了找到答案，他从伦敦金融城一个交易大厅的约200位交易员(其中3人是女性)中招募了44位男性。

To find out, he recruited 44 men from a trading floor of about 200, all but three of whom were male, in the City of London.

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