# Out-of-hours services in Zealand, Denmark. Consequences of changeover from GP-cooperative to integrated deputized services. A retrospective cohort study

## TL;DR

This study examines how changing the structure of out-of-hours medical services in Zealand, Denmark, affected patient care and hospital admissions.

## Contribution

The study provides new insights into the impact of reorganizing out-of-hours services on patient pathways and emergency admissions.

## Key findings

- Patient pathways in out-of-hours services decreased after transitioning to a regional service model.
- Emergency department admissions per 100,000 inhabitants dropped following the organizational change.
- The proportion of emergency admissions increased despite fewer overall patient cases.

## Abstract

Out-of-hours services (OOHS) worldwide exhibit diverse organisational models, especially within the European Union. This study aims to describe the transformation of OOHS in Region Zealand, Denmark, from a General Practitioner cooperative (GP-OOHS) to a regional organization/service, known as the 1818 Medical Helpline (1818).

Retrospective cohort study.

GP-OOHS data (January 2017–October 2023) during the transition from GP-cooperative to Regional Service (October 2022) were analysed. Coded and timestamped services retrieved from the billing system were used to identify patient pathways, defined as services within a 12-hour window. Descriptive statistics were applied.

A total of 2,572,951 patient pathways were recorded, with 2,258,072 under GP-out-of-hours service and 314,879 under the 1818. Overall, patient pathway volumes declined from 412,116 in 2017 to 314,879 in 2022, and admissions fell from 64,555 to 59,967. The median patient age was 35 years. The GP-out-of-hours service had a higher average monthly volume of patient pathways (32,726 vs. 25,940), while 1818 showed a higher proportion of emergency department admissions within 24 h (19.0% vs. 17.6%), the number of admissions fell from 8.2 per 100,000 inhabitants to 7.1 per 100,000 inhabitants. Interrupted time series analysis showed that the previously increasing tendency in ED admissions flattened following the transition. Although the absolute number of children admitted decreased, the proportion of admissions increased due to overall decline in patient pathways. Face-to-face consultations (31.4% vs. 27.1%) and home visits (9.4% vs. 3.4%) were more frequent in GP-out-of-hours service, both being associated with higher admission rates.

OOHS patient pathways declined over the study period and continued to decline following the organizational change. The absolute number of emergency department admissions also decreased, while the relative proportion of admissions increased. These findings indicate a continued decline in OOHS activity and a slight shift toward more acute cases after the reorganisation.