Over an average of 8.2 years of follow-up, 554 participants experienced fatal and nonfatal cardiovascular events, including myocardial infarction, stroke, coronary artery disease, and heart failure.

The main outcome measures were atherosclerotic events, including fatal or nonfatal ischemic heart disease, fatal or nonfatal stroke, and peripheral arterial disease.

Those who worked at least 10 hours a day had a 60 percent higher risk of heart-related problems, such as death due to heart disease or a nonfatal heart attack, than those who didn't work overtime.