The results indicate that long working hours directly and indirectly (via short sleep duration) induce headache even in apparently healthy white-collar men. Headache in employees may be useful for early detection of adverse health effects by long working hours.
The original version of this article unfortunately contained a mistake. The presentation of Tables 1 and 4 were incorrect. Statistical analyses, OR and the 95% CI in the original text and tables are based on the correct data. The corrected tables are given below.
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