而哈佛大學環境衛生系的布朗(J. M. Braun)等人在檢測了389名孕婦尿液中的雙酚A含量後發現,超市的收銀員可能因為比一般人更多地接觸發票,尿液中雙酚A平均濃度最高,為2.8微克/克,而教師和工廠工人尿液中雙酚A平均含量分別為1.8微克/克和1.2微克/克[8]。作者在討論中謹慎地表示,由於所采的孕婦樣本中只有17名是收銀員,這個結果需要謹慎解讀,但他們還是建議收銀員在工作時採取保護措施(如戴上手套)。
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