Frailty is a clinical syndrome characterised by impaired homeostatic mechanisms and reduced physiological reserve. Hospital admissions for ambulatory care sensitive conditions (ACSCs) are commonly used as indicators of quality in primary healthcare. We aimed to examine the association between frailty and the use of healthcare resources, including unplanned hospital visits due to ACSCs and non-ACSCs and visits to general practitioners (GPs) and medical specialists (MSs) in primary care. We hypothesised that frail individuals would have similar odds of hospital visits due to ACSCs and non-ACSCs.

Registry-based epidemiological study.

Data from the Danish Lolland-Falster Health Study and national health registers. Data were collected in a rural region of Denmark between February 2016 and February 2020.

10 154 randomly selected individuals aged ≥50 years participating in the Lolland-Falster Health Study with valid frailty measurements.

Hospital visits due to any diagnosis, hospital visits due to ACSCs and non-ACSCs, and visits to GPs and MSs in the primary care sector.

After adjustment for age, sex, comorbidity and socioeconomic factors, frail participants had higher odds of hospital visits due to any diagnosis (OR 1.27, 95% CI 1.02 to 1.57; p=0.03). The odds of hospital visits due to ACSCs (OR 1.42, 95% CI 0.97 to 2.08; p=0.07) and non-ACSCs (OR 1.16, 95% CI 0.91 to 1.47; p=0.22) were not significantly different. Frail individuals had higher odds of visiting their GP (OR 1.21, 95% CI 1.00 to 1.46; p=0.047) but not a medical specialist (OR 0.82, 95% CI 0.62 to 1.07; p=0.15).

Among frail individuals, the distinction between unplanned hospital visits due to ACSCs and non-ACSCs is not meaningful. This finding is consistent with the understanding of frailty as a state of reduced physiological reserve, in which minor stressors may lead to hospital care regardless of diagnostic category.