Previous studies have generally focused on people who were depressed or anxious, Miller said. Or they looked at both depression and anxiety, but lumped all types of anxiety together.

米勒说，以往的研究总是着重在诊断病人患的是“抑郁”还是“焦虑”，或者是把病人诊断为兼有“抑郁”和“焦虑”，但把不同类型的“焦虑”混为一起。