Impact of household characteristics on patient outcomes post hip fracture: a Welsh nationwide observational cohort study

Background: Hip fracture is common in older people and has significant health and care implications. This study aimed to examine the impact of household characteristics (living alone or living with someone who is themselves ill) on adverse outcomes following hip fracture. Methods: A cohort study of hip fracture patients aged ≥ 50 years living alone or with one co-resident using Welsh nationwide data between January 2013 and December 2018. Outcomes were emergency hospital admission within 30 days and care-home admission and mortality within one year of hospital discharge. Analysis used cause-specific Cox proportional hazards models to examine associations with living alone and with co-resident chronic disease status. Results: Of the 12,089 hip fracture patients discharged, 56.0% lived alone. Compared to hip fracture patients living with a co-resident, those living alone were more commonly women (78.4% versus 65.2%), older (mean 83.1 versus 78.5 years), and had more long-term conditions (mean 5.7 versus 5.3). In unadjusted analyses, compared to living with a co-resident with 0–1 long-term condition and no dementia, living alone (hazard ratio [HR] 1.44, 95%CI 1.23–1.68), living with someone with dementia (HR 1.57, 95%CI 1.07–2.30), and living with someone with 4 + physical long-term conditions (HR 1.24, 95%CI 1.03–1.49) were associated with an increase in mortality, but no significant association was found in adjusted analysis. Adjusted for age, sex, socioeconomic position, and long-term condition count of the hip fracture patient, living alone (adjusted HR [aHR] 2.26, 95%CI 1.81–2.81) and living with a co-resident with dementia (aHR 2.38, 95%CI 1.59–3.57) were both associated with more than double the risk of care home admission. There were no significant associations with 30-day hospital admission. Conclusions: Hip fracture patients who live alone have higher one-year mortality, but associations are explained by the demographic and clinical characteristics of those living alone. However, living alone or living with a co-resident with dementia was independently associated with an additional doubling of the risk of care home admission. Household-based approaches to research and health policy may help target risk groups following hip fracture community discharge and further research is needed to understand the mechanisms by which these associations act.