Publication date: Jul 07, 2025

COVID-19 has led to significant global morbidity and mortality, with clinical outcomes varying widely among individuals. Understanding the impact of comorbidities on COVID-19 outcomes is essential for improving patient management. To date, analyses of comorbidities affecting COVID-19 severity in a heterogeneous Swiss cohort across multiple outbreak waves are unavailable. The objective of this study was to explore the role of comorbidities on COVID-19 severity in hospitalized patients from a diverse Swiss cohort and to evaluate the association between comorbidities and specific in-hospital complications. This retrospective, observational, single-center study included adult patients who were hospitalized for COVID-19 for at least one night at the Cantonal Hospital Baselland, Switzerland (KSBL), between March 2020 and December 2021. Logistic regression analyses adjusted for age and gender were performed to analyze the association between comorbidities and critical condition (defined as severe disease or in-hospital death) and complications. A total of 1124 patients were included in the study (median age 66, range 19-100 years, 60% male). A total of 76% of patients had at least one comorbidity. The most common comorbidities were arterial hypertension (47%), obesity (27%), and diabetes mellitus (24%). Overall, 16% of patients experienced a critical condition, and 25. 5% had any type of complication. Patients without comorbidities had the lowest rates of critical condition (5. 3%) and complications (10. 2%). Obesity (OR 2. 01, p < 0. 001), diabetes mellitus (OR 1. 67, p = 0. 004), arterial hypertension (OR 1. 65, p = 0. 006), arrhythmia (OR1. 87, p = 0. 003), and chronic obstructive pulmonary disease (OR 2. 72, p < 0. 001) were found to be associated with critical condition. The most frequently observed complication was acute kidney failure, affecting 17. 1% of the study population, while patients with arrhythmia showed the highest overall complication rate (42%). Our findings are consistent with previous research, confirming the relevance of specific comorbidities as key risk factors for critical COVID-19 outcomes. Among all comorbid conditions evaluated, asthma appeared to have the least impact on disease severity. Future research should focus on the impact of the combination of comorbidities on the disease severity of COVID-19, as well as the long-term effects of COVID-19 for patients with certain comorbidities.

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