Patient variables—collected at enrolment
| Patient variables—collected at enrolment | Collection method |
| Age/sex/ethnicity/race demographic data | Chart review |
| Body mass index | Chart review |
| Comorbidities: Charlson* and functional indices** | Chart review |
| Baseline function: Functional Status Score for ICU77 | Proxy interview (see Outcomes below) |
| Baseline function: Katz Activities of Daily Living Scale154 and Lawton IADL | Proxy interview (see Outcomes below) |
| Baseline function: SF-36 Physical Function domain and walk impairment question | Proxy interview |
| Clinical Frailty Scale | Proxy interview |
| ICU admission diagnosis (eg, sepsis, renal failure) | Chart review |
| Severity of illness: APACHE II† | Chart review |
| Patient location immediately prior to ICU and to hospital admission | Chart review |
*Charlson Index: a score for in- patients derived from 19 comorbidities; an increased score reflecting increased 1 -year mortality. 155
**Functional Index: an 18-diagnosis scale for ICU patients predicting 1 - year SF-36 Physical Function score; increased score reflecting worse function. 156–158
†APACHE II: a severity of illness index using age, medical conditions and acute physiology, with higher scores reflecting increased short-term mortality. 159
IADL, instrumental activities of daily living; ICU, intensive care unit.