# Themes

    library(sumExtras)
    library(gtsummary)
    library(gt)

## `use_jama_theme()`

`use_jama_theme()` sets the `{gtsummary}` theme to JAMA compact styling for the rest of your session. It reduces padding, tightens font sizes, and produces tables suited for publication or reports.

    use_jama_theme()

    trial |>
      tbl_summary(by = trt) |>
      extras()

| Overall N = 200 1 | Drug A N = 98 1 | Drug B N = 102 1 | p-value 2
--- | --- | --- | --- | ---
Age | 47 (38, 57) | 46 (37, 60) | 48 (39, 56) | 0.718
Unknown | 11 | 7 | 4 |
Marker Level (ng/mL) | 0.64 (0.22, 1.41) | 0.84 (0.23, 1.60) | 0.52 (0.18, 1.21) | 0.085
Unknown | 10 | 6 | 4 |
T Stage |  |  |  | 0.866
T1 | 53 (27%) | 28 (29%) | 25 (25%) |
T2 | 54 (27%) | 25 (26%) | 29 (28%) |
T3 | 43 (22%) | 22 (22%) | 21 (21%) |
T4 | 50 (25%) | 23 (23%) | 27 (26%) |
Grade |  |  |  | 0.871
I | 68 (34%) | 35 (36%) | 33 (32%) |
II | 68 (34%) | 32 (33%) | 36 (35%) |
III | 64 (32%) | 31 (32%) | 33 (32%) |
Tumor Response | 61 (32%) | 28 (29%) | 33 (34%) | 0.530
Unknown | 7 | 3 | 4 |
Patient Died | 112 (56%) | 52 (53%) | 60 (59%) | 0.412
Months to Death/Censor | 22.4 (15.9, 24.0) | 23.5 (17.4, 24.0) | 21.2 (14.5, 24.0) | 0.145
1 Median (Q1, Q3); n (%)
2 Wilcoxon rank sum test; Pearson’s Chi-squared test

This is equivalent to calling `gtsummary::set_gtsummary_theme(gtsummary::theme_gtsummary_compact("jama"))` but shorter to type.

To reset back to the default `{gtsummary}` theme:

    gtsummary::reset_gtsummary_theme()

## `theme_gt_compact()`

When you mix `{gtsummary}` tables with plain `{gt}` tables in the same document, the styling mismatch is noticeable. `theme_gt_compact()` applies the same JAMA compact look to `{gt}` tables.

#### Default gt

    trial |>
      select(trt, age, grade) |>
      head(10) |>
      gt::gt()

#### With theme_gt_compact()

    trial |>
      select(trt, age, grade) |>
      head(10) |>
      gt::gt() |>
      theme_gt_compact()

Chemotherapy Treatment | Age | Grade
--- | --- | ---
Drug A | 23 | II
Drug B | 9 | I
Drug A | 31 | II
Drug A | NA | III
Drug A | 51 | III
Drug B | 39 | I
Drug A | 37 | II
Drug A | 32 | I
Drug A | 31 | II
Drug B | 34 | I

Chemotherapy Treatment | Age | Grade
--- | --- | ---
Drug A | 23 | II
Drug B | 9 | I
Drug A | 31 | II
Drug A | NA | III
Drug A | 51 | III
Drug B | 39 | I
Drug A | 37 | II
Drug A | 32 | I
Drug A | 31 | II
Drug B | 34 | I

You can layer additional `{gt}` styling on top:

    trial |>
      dplyr::select(trt, age, grade, marker) |>
      head(8) |>
      gt::gt() |>
      theme_gt_compact() |>
      gt::tab_header(
        title = "Trial Patient Sample",
        subtitle = "First 8 patients"
      )

Trial Patient Sample
First 8 patients
Chemotherapy Treatment | Age | Grade | Marker Level (ng/mL)
--- | --- | --- | ---
Drug A | 23 | II | 0.160
Drug B | 9 | I | 1.107
Drug A | 31 | II | 0.277
Drug A | NA | III | 2.067
Drug A | 51 | III | 2.767
Drug B | 39 | I | 0.613
Drug A | 37 | II | 0.354
Drug A | 32 | I | 1.739

## More Vignettes

- `vignette("sumExtras-intro")` – getting started with extras()
- `vignette("labeling")` – dictionary-based labeling
- `vignette("styling")` – group headers and advanced formatting
- `vignette("options")` – .Rprofile options for automatic labeling