High blood pressure, obesity and diabetes were the most common comorbid conditions among more than 5,000 coronavirus patients in New York City and nearby areas, a new study shows.

Using data from electronic health records, researchers from the Feinstein Institutes for Medical Research examined the clinical course, characteristics and outcomes of 5,700 patients who were hospitalized in 12 Northwell Health hospitals in New York City, Long Island and Westchester County, New York, between March 1 and April 4.

Among the 5,350 patients who presented with a comorbid condition, more than 3,000 – or nearly 57% – had high blood pressure, while 41.7% were obese and 33.8% had diabetes, according to the study. Overall, the median age of patients was 63 years old, about 60% were male and on average, patients were discharged within four days.

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Of 2,634 patients who were discharged or had died by the end of the study's timeframe, about 1 in 5 – 553 – had died, and about 14% were treated in the intensive care unit. About 12% required mechanical ventilation.

Among patients who died, the study said, those with diabetes were more likely to have been placed on a ventilator or to have received care in the ICU compared with those who did not have the condition.

"Older persons, men, and those with pre-existing hypertension and/or diabetes were highly prevalent in this case series and the pattern was similar to data reported from China," the study said. "However, mortality rates in this case series were significantly lower, possibly due to differences in thresholds for hospitalization."

The study also found that nearly 90% of coronavirus patients who were put on ventilators died, with those between the ages of 18 and 65 experiencing a 76.4% mortality rate and those older than 65 having a 97.2% mortality rate. Mortality rates for those who did not receive mechanical ventilation were nearly 20% for those 18 to 65 years old and about 27% for those older than 65.

There were no deaths among patients younger than 18, the results showed.

"The findings of high mortality rates among ventilated patients are similar to smaller case series reports of critically ill patients in the U.S.," said the study, which the authors believe to be "the first large case series of sequentially hospitalized patients" with confirmed cases of COVID-19 in the U.S.

New York City has been the hub of the novel coronavirus pandemic in the United States, with roughly 135,000 confirmed cases and nearly 36,000 estimated hospitalizations as of April 21, according to its city health department . The city has seen about 10,000 coronavirus deaths.