Table One

Last updated on 2025-09-02 | Edit this page

Estimated time: 12 minutes

Overview

Questions

  • How do you make a Table One?
  • How do you make a Table One that is easy to configure?

Objectives

  • Explain what a Table One is
  • Know how to make a Tabel One and adjust key parameters

What is a “Table One”?

Primarily used in medical and epidemiological research, a Table One is typically the first table in any publication using data.

It presents the baseline characteristics of the participants in a study, and provides a concise overview of the relevant demographic and clinical variables.

It typically compares different groups (male~female, treatment~control), to highlight similarities and differences.

R 

1+1

OUTPUT 

[1] 2

ERROR 

Error: 'episodes/data/BLOOD.csv' does not exist in current working directory ('/home/runner/work/R-toolbox/R-toolbox/site/built').

ERROR 

Error: object 'blood' not found

ERROR 

Error: object 'blood' not found

ERROR 

Error: object 'blood' not found

ERROR 

Error: object 'blood' not found

ERROR 

Error: object 'blood' not found

ERROR 

Error: object 'blood' not found

ERROR 

Error: object 'blood' not found

ERROR 

Error: object 'blood' not found

It can look like this:

ERROR 

Error: object 'blood' not found

R 

blood |> 
  tbl_strata2(
    strata = case,
    .tbl_fun = ~ .x |> 
      tbl_summary(include = c(ageblood, estradol, testost),
    type = all_continuous() ~"continuous2",
      statistic = all_continuous() ~c(
             "{N_nonmiss}",
        "{median} ({p25}, {p75})",
        "{min}, {max}"
         )
      ) |> 
      add_n() 
      
  )  |> as_gtsummary()

R 

tbl_summary(blood, 
            by = case, 
              type = all_continuous() ~ "continuous2", # for at få multilinie summary stats
            include = c(ageblood, testost, curpmh),
                statistic = all_continuous() ~ c(
      "{mean} ({min}, {max})",
      "{median} ({p25}, {p75})"
    )
            ) |>
    add_overall(last = TRUE)

ERROR 

Error in add_overall(tbl_summary(blood, by = case, type = all_continuous() ~ : could not find function "add_overall"

Og det gør vi så med gt i stedet. er der lettere måder? Ja, det er der. Link til lettere måde. Men! det her giver os ret omfattende muligheder for at tilpasse tabellen.

Herunder er vi ikke helt i mål endnu. Men vi er ret tæt.

R 

library(dplyr)
library(gtsummary)

# grunddata
base <- blood |>
  select(age, grade, stage, trt) |>
  mutate(grade = paste("Grade", grade))

# rækkefølge på paneler: Overall først, derefter Grade I/II/III
lvl <- c("Overall", paste("Grade", levels(trial$grade)))

# lav et samlet datasæt med et ekstra "Overall"-panel
df <- bind_rows(
  base |> mutate(.panel = "Overall"),
  base |> mutate(.panel = grade)
) |>
  mutate(.panel = factor(.panel, levels = lvl))

# tabel: tre strata + et overall-stratum
tbl <- df |>
  tbl_strata(
    strata = .panel,
    .tbl_fun = ~ .x |>
      select(-grade) |> 
      tbl_summary(by = trt, missing = "no") |>
      add_n(),
    .header = "**{strata}**, N = {n}"
  )

tbl

Primarily of use if there are medical students on the course

Key Points
  • A Table One provides a compact describtion of the data we are working with
  • With a little bit of work we can control the content of the table.