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Author response to “Time of day of cognitive tests might distort shift-work study results”
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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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Competing interests None.
Provenance and peer review Not commissioned; internally peer reviewed.
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