Add survival summary information to a ggKM legend

Modifies the legend of a ggKM plot by appending the median survival time and its 95% confidence interval¹ to each group label. If exactly two groups are present, the legend is further extended with the hazard ratio, 95% confidence interval, and p-value from a Cox regression model² comparing the two groups.

Usage

ggKM.surv.extra(input)

Arguments

input

A ggKM plot object.

Value

A deep copy of the input ggKM object with the added legend label.

References

1. Brookmeyer, R. and Crowley, J., 1982. A confidence interval for the median survival time. Biometrics, pp. 29–41.

2. Cox, D.R., 1972. Regression Models and Life-Tables. Journal of the Royal Statistical Society, Series B. 34(2), pp. 187–220.