Classification based on established SCI literature (Grassner et al. 2025, Freund et al. 2019):
<= 1 day: hyperacute
2–14 days: acute
15–90 days: subacute
91–365 days: intermediate
more than 365 days: chronic
Examples
classify_phase(c(0, 5, 30, 200, 400))
#> [1] hyperacute acute subacute intermediate chronic
#> Levels: hyperacute < acute < subacute < intermediate < chronic