r - ggplot y轴调整和统计

Question

我正在使用mtcars数据集运行条形图，添加统计数据以进行组比较。使用下面的代码，我得到了与 ** 的统计比较

ggbarplot(
  mtcars, x = "am", y = "mpg",
  add = "mean_sd",fill = "black",
  xlab = "AM",
  ylab="Fuel consumption (Miles/ Gallon)"
) +
  stat_compare_means(
    comparisons = list(c("0", "1")), 
    label = "p.signif"
  ) + scale_x_discrete(labels= c(0,1))

但是，我想调整 ylim。当我运行下面的代码时，统计比较丢失了（我猜是移出视图）。无论如何调整 ylim 并保持统计数据

ggbarplot(
  mtcars, x = "am", y = "mpg",
  add = "mean_sd",fill = "black",
  xlab = "AM",
  ylab="Fuel consumption (Miles/ Gallon)",ylim=c(0,30)
) +
  stat_compare_means(
    comparisons = list(c("0", "1")), 
    label = "p.signif"
  ) + scale_x_discrete(labels= c(0,1))