Figure 1

The Kaplan-Meier survival analysis is based on the total survival time in the period from the onset of illness to discharge or death in the critical patients with HFRS. The event of interest was defined as patient death during hospitalization and patient discharge as censored. Of the 75 critical patients, the cumulative proportion surviving of 85.3% at the first week interval, 70.7% at the second week interval, 65.1% at the third week interval and 63.7% at the fourth week interval.