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J Occup Environ Med. 2007 Jan;49(1):1-10.

Fatigue in the U.S. workforce: prevalence and implications for lost productive work time.

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Caremark, Hunt Valley, Maryland 21031, USA.



The objective of this study was to estimate fatigue prevalence and associated health-related lost productive time (LPT) in U.S. workers.


Fatigue prevalence, LPT due to fatigue, and LPT for any health-related reason (in hours and dollars) were measured in a national cross-sectional telephone survey of U.S. workers.


The 2-week period prevalence of fatigue was 37.9%. Of workers with fatigue, 65.7% reported health-related LPT compared with 26.4% of those without fatigue. Workers with fatigue cost employers 136.4 billion dollars annually in health-related LPT, an excess of 101.0 billion dollars compared with workers without fatigue. Fatigue frequently co-occurs with other conditions and, when present, is associated with a threefold increase, on average, in the proportion of workers with condition-specific LPT.


Fatigue is prevalent in the U.S. workforce. When occurring with other health conditions, it is associated with significantly more condition-specific LPT.

[Indexed for MEDLINE]

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