Returns the median survival with upper and lower confidence limits for the median at 95% confidence levels.
surv_median(fit, combine = FALSE)
| 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. |
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.
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)#> strata median lower upper #> 1 All 2351 2018 2910surv_median(fit2)#> strata median lower upper #> 1 adhere=0 2718 2213 NA #> 2 adhere=1 1272 997 1885surv_median(fit.list)#> $sex #> strata median lower upper #> 1 sex=0 2174 1752 NA #> 2 sex=1 2527 1976 2910 #> #> $adhere #> strata median lower upper #> 1 adhere=0 2718 2213 NA #> 2 adhere=1 1272 997 1885 #>surv_median(fit.list, combine = TRUE)#> id strata median lower upper #> 1 sex sex=0 2174 1752 NA #> 2 sex sex=1 2527 1976 2910 #> 3 adhere adhere=0 2718 2213 NA #> 4 adhere adhere=1 1272 997 1885# Grouped survfit #::::::::::::::::::::::::::::::::::::::::::::::::::::::: fit.list2 <- surv_fit(Surv(time, status) ~ sex, data = colon, group.by = "rx") surv_median(fit.list2)#> $`rx.Obs::sex` #> strata median lower upper #> 1 sex=0 1981 1272 NA #> 2 sex=1 1539 1195 2284 #> #> $`rx.Lev::sex` #> strata median lower upper #> 1 sex=0 1885 1275 NA #> 2 sex=1 1548 1061 2593 #> #> $`rx.Lev+5FU::sex` #> strata median lower upper #> 1 sex=0 NA 2021 NA #> 2 sex=1 NA NA NA #>