The number of decimal places in the x and y axis label depends on how wide the range is.
.number_decimals_plot_axis(
PPV_NPV = "PPV",
min_FP = 0,
max_FP,
min_FN,
max_FN,
min_Prevalence,
max_Prevalence
)
.
.
.
.
.
[x] out of y prevalence of disease
x out of [y] prevalence of disease