By the end of the study, people who had worked 10-hour days were 60 percent more likely to have heart problems than people who worked seven-hour days. People who worked 8 or 9 hours a day had no significant increases in heart problems.
By the end of the study, people who had worked 10-hour days were 60 percent more likely to have heart problems than people who worked seven-hour days. People who worked 8 or 9 hours a day had no significant increases in heart problems.
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