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Time of day of cognitive tests might distort shift work study results
  1. Gerhard B Holt
  1. Correspondence to Dr Gerhard B Holt, Philadelphia, Pennsylvania 19143, USA; ghol7955{at}

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Marquié et al 1 find that “shift work chronically impairs cognition”. There might be a non-conservative bias in these results leading to potential false-positive findings if the tests of cognition were administered during the day. …

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