Here’s something to make you think twice about getting surgery this summer — hospital death rates apparently increase in July.

According to a brief article in the New York Times, a new study published this month in Annals of Internal Medicine seems to confirm the rumor that injuries and deaths suffered in hospitals increase each summer when new medical school graduates begin to treat patients. This phenomenon would normally be limited to “teaching” hospitals, where the graduates work first before later transferring to other hospitals. The new study shows that patient death rates in teaching hospitals increase by eight percent in July.

The study also reported longer hospital stays, more drawn-out procedures and higher hospital charges in July, “when 20 to 30 percent of the more experienced doctors-in-training leave and a class of newly minted doctors starts working at teaching hospitals.”

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