Working interpretation bands for the whole-grid PCI returned by
pr_calc_pci().
Value
A tibble::tibble with columns region, parameter,
threshold, unit, interpretation, source, band, band_min,
band_max.
Details
The first six columns match the other pr_ref_* tables
(pr_ref_saddle(), pr_ref_diabetic_foot(), pr_ref_wheelchair()), with
threshold holding the lower edge of each band; band, band_min and
band_max are appended so the interval can be used programmatically.
band_max is Inf for the open top band.
Unlike the other reference tables, these bands are not taken from a
published clinical threshold study. They are the working ranges used to
describe whole-grid saddle-mat recordings, and they apply only to
pr_calc_pci(trial, denominator = "grid"). PCI is dimensionless and
scale-free in pressure, but it is not comparable across devices with
different grid sizes, because the whole-grid mean depends on how much
unloaded mat surrounds the contact patch.
See also
Other whole-grid frame metrics:
pr_calc_cop_grid(),
pr_calc_loaded_count(),
pr_calc_mean_pressure_grid(),
pr_calc_pci(),
pr_calc_total_pressure(),
pr_frame_metrics()
Examples
pr_ref_pci()
#> # A tibble: 4 × 9
#> region parameter threshold unit interpretation source band band_min band_max
#> <chr> <chr> <dbl> <chr> <chr> <chr> <chr> <dbl> <dbl>
#> 1 whole… pci 3 ratio Good: 3-6, lo… Worki… good 3 6
#> 2 whole… pci 6 ratio Moderate: 6-1… Worki… mode… 6 10
#> 3 whole… pci 10 ratio Poor: 10-20, … Worki… poor 10 20
#> 4 whole… pci 20 ratio Very poor: ab… Worki… very… 20 Inf
# Classify one recording:
pci <- pr_calc_pci(pr_example_trial("saddle_horse"))
ref <- pr_ref_pci()
ref$band[pci >= ref$band_min & pci < ref$band_max]
#> [1] "poor"