Related Experiment Video

Updated: Jun 7, 2025

Inverse Probability of Treatment Weighting Propensity Score using the Military Health System Data Repository and National Death Index
06:55

Inverse Probability of Treatment Weighting Propensity Score using the Military Health System Data Repository and National Death Index

Published on: January 8, 2020

14.4K

The Impact of Comorbidity and Age on the Risk of Hospitalization and Mortality in Patients with Previous COVID-19

Ken Lund1,2, Jan Nielsen1,2, Simon Kjeldsen3

  • 1Center for Clinical Epidemiology, Odense University Hospital, 5000 Odense, Denmark.

Journal of Clinical Medicine
|November 9, 2024
PubMed

Insights

Comorbidity significantly increases hospitalization and mortality risk for adults and older adults up to two years after COVID-19. Specific underlying conditions, like dementia, further elevate mortality risks, especially in older populations.

Area of Science:

  • Infectious Diseases
  • Epidemiology
  • Gerontology

Background:

  • Long-term outcomes of COVID-19, particularly concerning comorbidity, remain underexplored in adults and older adults.
  • Understanding the impact of pre-existing conditions on post-COVID-19 hospitalization and mortality is crucial for public health.
  • The Charlson Comorbidity Index (CCI) is a widely used measure for quantifying disease burden.

Purpose of the Study:

  • To investigate the influence of comorbidity on long-term hospitalization and mortality following COVID-19 infection.
  • To compare risks between adults (40-59 years) and older adults (≥60 years) based on comorbidity levels.
  • To identify specific underlying diseases that contribute most significantly to adverse outcomes after COVID-19.

Main Methods:

  • A Danish population-based cohort study included over 1 million individuals with a positive COVID-19 PCR test.
  • Patients were categorized by Charlson Comorbidity Index (CCI) scores (0, 1-2, ≥3) and age groups (adults, older adults).
  • Cox regression models were used to estimate adjusted hazard ratios (HR) for hospitalization and mortality, controlling for confounders.

Main Results:

  • A CCI score of ≥3 was associated with significantly higher adjusted HRs for hospitalization (4.54 in adults, 3.05 in older adults) and mortality (21.04 in adults, 4.61 in older adults).
  • Individual disease categories within the CCI influenced risk estimates, with dementia showing the most substantial impact on mortality.
  • Increased risk of hospitalization and mortality was observed even with a CCI score of 1 or above.

Conclusions:

  • Comorbidity, as indicated by a CCI score of 1 or higher, substantially increases the risk of hospitalization and mortality for up to two years post-COVID-19.
  • The specific type of underlying disease significantly modifies the risk of adverse outcomes, particularly in older adults.
  • These findings highlight the importance of managing comorbidities in individuals diagnosed with COVID-19 to mitigate long-term health consequences.

Keywords:
COVID-19comorbidityhospitalizationmortalitynationwide

More Related Videos

Establishing a Competing Risk Regression Nomogram Model for Survival Data04:57

Establishing a Competing Risk Regression Nomogram Model for Survival Data

Published on: October 23, 2020

10.1K
Assessment of Dependence in Activities of Daily Living Among Older Patients in an Acute Care Unit06:52

Assessment of Dependence in Activities of Daily Living Among Older Patients in an Acute Care Unit

Published on: September 30, 2020

9.7K

Related Concept Videos

Factors Affecting the Risk of Infection01:26

Factors Affecting the Risk of Infection

The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin...
11.4K
Pneumonia III: Complications and Assessment01:30

Pneumonia III: Complications and Assessment

Pneumonia poses the potential for numerous complications that warrant consideration. These complications include the following:
170
Factors Affecting Illness01:18

Factors Affecting Illness

When a person's physical, emotional, intellectual, social development or spiritual functioning is compromised, this deviation from a healthy normal state is called illness. Illness creates stress that in turn harms individuals. Irritation, anger, denial, hopelessness, and fear are behavioral and emotional changes an individual experiences in the phases of illness. A variety of factors influence a person's health and well-being.
For instance, risk factors are connected to illness,...
4.2K
Comparing the Survival Analysis of Two or More Groups01:20

Comparing the Survival Analysis of Two or More Groups

Survival analysis is a cornerstone of medical research, used to evaluate the time until an event of interest occurs, such as death, disease recurrence, or recovery. Unlike standard statistical methods, survival analysis is particularly adept at handling censored data—instances where the event has not occurred for some participants by the end of the study or remains unobserved. To address these unique challenges, specialized techniques like the Kaplan-Meier estimator, log-rank test, and...
154
Causality in Epidemiology01:21

Causality in Epidemiology

Causality or causation is a fundamental concept in epidemiology, vital for understanding the relationships between various factors and health outcomes. Despite its importance, there's no single, universally accepted definition of causality within the discipline. Drawing from a systematic review, causality in epidemiology encompasses several definitions, including production, necessary and sufficient, sufficient-component, counterfactual, and probabilistic models. Each has its strengths and...
321
COPD: Pathogenesis and Clinical Features01:20

COPD: Pathogenesis and Clinical Features

Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
235