surv_median {survminer}

Median of Survival Curves

Description

Returns the median survival with upper and lower confidence limits for the median at 95% confidence levels.

Usage

surv_median(fit, combine = FALSE)

Arguments

fit

A survfit object. Can be also a list of survfit objects.

combine

logical value. Used only when fit is a list of survfit objects. If TRUE, combine the results for multiple fits.

Value

Returns for each fit, a data frame with the following column:

• strata: strata/group names

• median: median survival of each group

• lower: 95% lower confidence limit

• upper: 95% upper confidence limit

Returns a list of data frames when the input is a list of survfit objects. If combine = TRUE, results are combined into one single data frame.

Examples

library(survival)

# Different survfits
#:::::::::::::::::::::::::::::::::::::::::::::::::::::::
fit.null <- surv_fit(Surv(time, status) ~ 1, data = colon)

fit1 <- surv_fit(Surv(time, status) ~ sex, data = colon)

fit2 <- surv_fit(Surv(time, status) ~ adhere, data = colon)

fit.list <- list(sex = fit1, adhere = fit2)

# Extract the median survival
#:::::::::::::::::::::::::::::::::::::::::::::::::::::::
surv_median(fit.null)

surv_median(fit2)

surv_median(fit.list)

surv_median(fit.list, combine = TRUE)

# Grouped survfit
#:::::::::::::::::::::::::::::::::::::::::::::::::::::::
fit.list2 <- surv_fit(Surv(time, status) ~ sex, data = colon,
                     group.by = "rx")
surv_median(fit.list2)