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Author response to “Time of day of cognitive tests might distort shift-work study results”
  1. J-C Marquié1,
  2. P Tucker2,
  3. S Folkard3,
  4. C Gentil4,
  5. D Ansiau5
  1. 1 CLLE (UMR 5263), Université de Toulouse—CNRS, Toulouse, France
  2. 2 Department of Psychology, Swansea University, Swansea, UK
  3. 3 Laboratoire d'Anthropologie Appliquée, Université Paris Descartes, Paris, France
  4. 4 Département d'Epidémiologie et de Santé Publique (UMR1027 INSERM), Université de Toulouse III—CHU, Toulouse, France
  5. 5 International University of Monaco, Monaco, Monaco
  1. Correspondence to Dr J-C Marquié, CLLE (UMR 5263), Université de Toulouse II—CNRS, Toulouse 31058, France; marquie{at}univ-tlse2.fr

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Holt suggests that the shift workers in our study1 may have been performing worse than day workers because they performed the tests during their ‘biological night’ (ie, during the day). It is indeed the case that the cognitive tests were administered during the day, but the available evidence suggests that even the vast majority (>95%) of permanent night workers fail to …

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