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The cumulative survival rates in the group with the failure of HFNC/NPPV > 6 hours after it was attempted (> 6 hours, dotted line), as compared to those in the group with the failure of HFNC/NPPV ≤ 6 hours after it was attempted (≤ 6 hours, gray line) groups. The p value was calculated using the log-rank test.
