A new study shows an 88% mortality rate among patients placed on ventilators from the coronavirus in New York's largest health system.

The results of a study from the Journal of the American Medical Association released Wednesday showed most hospital patients with the coronavirus died in Northwell Health after being placed on a ventilator.

The report examined health records of 5,700 patients with the novel coronavirus hospitalized, and 2,634 of those have either recovered enough to be discharged or have died. Twelve percent of these 2,634 patients were placed on a ventilator, a device that forces air into the lungs of patients who cannot independently breath, and 88.1% died.

[Click here for complete coronavirus coverage]

The study also underscores what some doctors have said about mortality, where those with the most serious cases of the COVID-19 virus have underlying medical conditions. The report showed 57% had high blood pressure, 41% were obese, and 34% had diabetes.

"Of the patients who died, those with diabetes were more likely to have received invasive mechanical ventilation or care in the ICU compared with those who did not have diabetes," the report said.

According to the New York Department of Health, more than 257,200 state residents have tested positive for the coronavirus, representing a large percentage of all cases in the United States.

More than 2.64 million have tested positive for the coronavirus globally. At least 184,000 people have died, and more than 721,000 have recovered. The U.S. has seen at least 842,000 confirmed cases, with nearly 76,600 reported recoveries.