Calculate Time to Last Vital Status — add_time_to_last

Adds `timetoevent_vitalstatus` column measuring months from histology assessment to the latest vital status date. For EMBRACE-I, uses the latest of assessment dates or last info date. For EMBRACE-II, also considers date of death when available.

Usage

add_time_to_last_vitalstatus(df)

Arguments

df: A data frame with histology assessment date and vital status information

Value

A data frame with added `timetoevent_vitalstatus` column

Examples

if (FALSE) { # \dontrun{
df <- data.frame(
  embrace_id = 1,
  study = "embrace_i",
  histology_assesment_date = as.Date("2020-01-01"),
  vital_status_last_info_date = as.Date("2022-06-01"),
  assessment_date_3m = as.Date("2020-04-01")
)
result <- add_time_to_last_vitalstatus(df)
} # }