What drives different treatment choices? Investigation of hospital ownership, system membership and competition

Association between hospital ownership and patient selection, management, and outcomes after carotid endarterectomy or carotid artery stenting : - Secondary data analysis of the Bavarian statutory quality assurance database

BACKGROUND

This study analyses the association between hospital ownership and patient selection, treatment, and outcome of carotid endarterectomy (CEA) or carotid artery stenting (CAS).

METHODS

The analysis is based on the Bavarian subset of the nationwide German statutory quality assurance database. All patients receiving CEA or CAS for carotid artery stenosis between 2014 and 2018 were included. Hospitals were subdivided into four groups: university hospitals, public hospitals, hospitals owned by charitable organizations, and private hospitals. The primary outcome was any stroke or death until discharge from hospital. Research was funded by Germany's Federal Joint Committee Innovation Fund (01VSF19016 ISAR-IQ).

RESULTS

In total, 22,446 patients were included. The majority of patients were treated in public hospitals (62%), followed by private hospitals (17%), university hospitals (16%), and hospitals under charitable ownership (6%). Two thirds of patients were male (68%), and the median age was 72 years. CAS was most often applied in university hospitals (25%) and most rarely used in private hospitals (9%). Compared to university hospitals, patients in private hospitals were more likely asymptomatic (65% vs. 49%). In asymptomatic patients, the risk of stroke or death was 1.3% in university hospitals, 1.5% in public hospitals, 1.0% in hospitals of charitable owners, and 1.2% in private hospitals. In symptomatic patients, these figures were 3.0%, 2.5%, 3.4%, and 1.2% respectively. Univariate analysis revealed no statistically significant differences between hospital groups. In the multivariable analysis, compared to university hospitals, the odds ratio of stroke or death in asymptomatic patients treated by CEA was significantly lower in charitable hospitals (OR 0.19 [95%-CI 0.07-0.56, p = 0.002]) and private hospitals (OR 0.47 [95%-CI 0.23-0.98, p = 0.043]). In symptomatic patients (elective treatment, CEA), patients treated in private or public hospitals showed a significantly lower odds ratio compared to university hospitals (0.36 [95%-CI 0.17-0.72, p = 0.004] and 0.65 [95%-CI 0.42-1.00, p = 0.048], respectively).

CONCLUSIONS

Hospital ownership was related to patient selection and treatment, but not generally to outcomes. The lower risk of stroke or death in the subgroup of electively treated patients in private hospitals might be due to the right timing, the choice of treatment modality or actually to better structural and process quality.

Hospital competition and health outcomes: Evidence from acute myocardial infarction admissions in Germany

Countries increasingly rely on competition among hospitals to improve health outcomes. However, there is limited empirical evidence on the effect of competition on health outcomes in Germany. We examined the effect of hospital competition on quality of care, which is assessed using health outcomes (risk-adjusted in-hospital and post-hospitalization mortality and cardiac-related readmissions), focusing on acute myocardial infarction (AMI) treatment. We obtained data on all hospital utilizations and mortality of 13.2% of the population from a large statutory health insurer and all AMI admission records from Diagnosis-Related Groups Statistic from 2015-19. We constructed the measures of hospital competition, which mitigates the possibility of endogeneity bias. The relationships between health outcomes and competition measures are estimated using linear probability models. Intense competition was associated with lower quality of care in terms of mortality and cardiac-related readmissions. Patients treated in hospitals facing high competition were 0.9 (1.2) percentage points more likely to die within 90 days (2 years) of admission, and 1.4 (1.6) percentage points more likely to be readmitted within 90 days (2 years) of discharge than patients treated in hospitals facing low competition. Our results indicate that hospital competition does not lead to better health outcomes for AMI patients in Germany. Therefore, additional measures are necessary to achieve quality improvement.