Reliability statistics for the single metric, and separate scales of self-care activities, instrumental activities and mobility limitations
| Single metric | ADL | IADL | Mobility | |
|---|---|---|---|---|
| Extreme persons | 48.5% | 91% | 84.6% | 49.4% |
| Cronbach’s α* | 0.90 | 0.78 | 0.78 | 0.84 |
| PR | 0.74 | 0.26 | 0.36 | 0.61 |
| Gp | 1.70 | 0.59 | 0.74 | 1.24 |
| Strata | 2.66 | 1.12 | 1.32 | 1.98 |
| TIF | 3.52 | 0.93 | 0.99 | 1.89 |
| SE | 0.55 | 1.04 | 1.01 | 0.73 |
SE (measured where information is maximum).
*Cronbach’s α coefficient is included only for comparative purposes that are detailed in the Discussion section.
ADL, activities of daily living, Gp, person separation; IADL, instrumental activities of daily living; PR, person (Rasch-based) reliability; TIF, test information function indicating the maximum information of the scale.