R: Median of Survival Curves

surv_median {survminer} | R Documentation

## 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)

[Package survminer version 0.4.1 Index]