JAMA Network, April 22, 2020, "Presenting Characteristics, Comorbidities, and Outcomes Among 5700 Patients Hospitalized With COVID-19 in the New York City Area":

"Mortality rates for those who received mechanical ventilation in the 18-to-65 and older-than-65 age groups were 76.4% and 97.2%, respectively. Mortality rates for those in the 18-to-65 and older-than-65 age groups who did not receive mechanical ventilation were 19.8% and 26.6%, respectively."

Well, of course, the people who were put on ventilators were the most ill patients to begin with, right? Perhaps. We don't know that.

In any case, the numbers are shocking.