Coffee consumption and psychological wellbeing among Japanese auto factory workers.

Although there was no significant association between coffee consumption and psychological wellbeing in male workers, subjects with coffee consumption of > 2 cups per day showed a trend of an increased percentage of positive GHQ12 score, which indicate poorer psychological wellbeing.

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When the number of daily tobacco smoking > 20 was adopted, an increasing trend was also recognized. 3.3.

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