Predictor inputs for frailty risk prediction model (independent variables)
| Name | Time span | Description | Comments |
|---|---|---|---|
| Age | Current spell | The startage field from HES | |
| Sex | Current spell | The sex field from HES | |
| Admission source | Current spell | The admiSorc field from HES | |
| Charlson (historic) | 24-month historic average | Calculated per spell, using all diagnoses from all episodes and then averaged. Excludes the current spell | |
| Charlson (current) | Current spell | Calculated using diagnoses in positions 2–20 from all episodes in the spell | |
| Anxiety and depression | 24-month historic binary indicator | A binary flag indicating whether a relevant diagnosis has been received during any inpatient spell in the past 24 months | Senility, dementia and delirium merged to form the cognitive impairment indicator because of changes in coding over time |
| Cognitive impairment | |||
| Dependence | |||
| Falls and fracture | |||
| Incontinence | |||
| Mobility problems | |||
| Pressure ulcers | |||
| Number of emergency admissions | 12-month historic count | The number of emergency admission spells in the previous 12 months, excluding the current spell | Normalised |
| Days since last emergency admission | 24-month historic | The number of days since the patient's last discharge from an emergency admission | Normalised. Default value used when the patient has not had an emergency admission in the previous 24 months |
HES, Hospital Episode Statistics.