## =============================================================================
## Requirements
## =============================================================================

library(gtsummary)

## =============================================================================
## Loop
## =============================================================================

bm_list_strat<-list()

for (i in 1:length(outs)){
  ## Bivariate
  biv<-dta |>
    select(all_of(c("active_treat",vars,outs[i]))) |>
    tbl_strata(
      strata = active_treat,
      .tbl_fun =
        ~ .x %>%
        tbl_uvregression(data=.,
                         y=outs[i],
                         method=lm,
                         label = lab_sel(labels_all,vars)
        )|> 
        add_global_p()|>
        bold_p() |>  
        bold_labels() |>
        italicize_levels(),
      .header = "**{strata}**, N = {n}"
    )
  
  ## Multivariate
  mul<-dta |>
    select(all_of(c("active_treat",vars,outs[i]))) |>
    tbl_strata(
      strata = active_treat,
      .tbl_fun =
        ~ .x %>%
        lm(formula(paste(c(outs[i],"."),collapse="~")), 
           data = .) |> 
        tbl_regression(label = lab_sel(labels_all,vars)
        )|> 
        add_n() |>
        add_global_p() |>
        bold_p() |>  
        bold_labels() |>
        italicize_levels(),
      .header = "**{strata}**, N = {n}"
    )
  
  ## Merge
  biv_mul_strat<-tbl_merge(
    tbls = list(biv, mul), 
    tab_spanner = c("**Bivariate linear regression**", 
                    "**Multivariate linear regression**") 
  )
  
  bm_list_strat[[i]]<-biv_mul_strat
}

## =============================================================================
## Big merge
## =============================================================================

bm_16_tbl_strat<-tbl_merge(
  tbls = bm_list_strat, 
  tab_spanner = c("**One month follow up**", 
                  "**Six months follow up**") 
)