Doctors Alert: Long working hours increase risk for heart attack and stroke
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In the past there have been two large studies of the existing data which suggested that working long hours increases the risk of coronary heart disease (CHD) by approximately 40%. These studies were, however criticized because they used only published studies, which might reflect a “positive publication bias” considering the fact that positive studies are more likely to be published.
However, to test this, researchers concentrated on this issue by performing a Prospective Trial. Kivimäki and colleagues have addressed such concerns and examined new CHD events among 603,838 individuals and new strokes among 528,908 individuals. The results were adjusted for socioeconomic status as well as age and gender.
The results demonstrate that individuals working ≥55 hours weekly experienced a 13% increase (95% CI, 2%–26%; P = .02) in the relative risk of CHD and a 33% increase risk of stroke (CI, 11%–61%; P = .002) compared with men and women working 35 hours to 40 hours weekly. The authors found no factors that could have influenced the results; however, there was an effect of socioeconomic status on CHD among high-quality studies.
However, to test this, researchers concentrated on this issue by performing a Prospective Trial. Kivimäki and colleagues have addressed such concerns and examined new CHD events among 603,838 individuals and new strokes among 528,908 individuals. The results were adjusted for socioeconomic status as well as age and gender.
The results demonstrate that individuals working ≥55 hours weekly experienced a 13% increase (95% CI, 2%–26%; P = .02) in the relative risk of CHD and a 33% increase risk of stroke (CI, 11%–61%; P = .002) compared with men and women working 35 hours to 40 hours weekly. The authors found no factors that could have influenced the results; however, there was an effect of socioeconomic status on CHD among high-quality studies.
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