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. 2020 Sep 7;18:274. doi: 10.1186/s12916-020-01761-0

Fig. 1.

Fig. 1

Kaplan-Meier estimates of the survival rate of severe disease among older COVID-19 patients by frailty status (non-frail, pre-frail, and frail) (non-frail and pre-frail, hazard ratio, 3.549; 95%CI, 1.016–12.396; P = 0.047. non-frail and frail, hazard ratio, 4.963; 95%CI, 1.443–17.074; P = 0.011)