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The clinical impact of prolonged steroid therapy in severe COVID-19 patients: a retrospective cohort study with propensity score matching

BMC Pulmonary Medicine volume 25, Article number: 222 (2025) Cite this article

Abstract

Background

The optimal duration of steroid therapy for patients with COVID-19 remains unclear. This study compared clinical outcomes between early steroid withdrawal (EW; ≤10 days) and prolonged steroid tapering (PT; >10 days) in patients with severe COVID-19 requiring oxygen support.

Methods

This retrospective, single-center cohort study included adult patients with COVID-19 and WHO-CPS scores of 6–9 admitted to a tertiary hospital in Seoul, Republic of Korea. After 1:1 propensity score matching, 68 patients were included in each group. Primary outcomes were 28-day and 60-day mortality. Secondary outcomes included clinical aggravation, rebound pneumonia, infectious complications, readmission or emergency department (ED) revisits, duration of oxygen support, and lengths of hospitalization and ICU stay.

Results

Baseline characteristics were well balanced after matching. No significant differences were observed in 28-day mortality (5.9% vs. 10.3%, HR 0.54, 95% CI 0.16–1.84, p = 0.32) or 60-day mortality (14.7% vs. 11.8%, HR 1.22, 95% CI 0.48–3.10, p = 0.67) between PT and EW groups. Rates of clinical aggravation, rebound pneumonia, infectious complications, and readmission or ED revisit were also comparable. However, the PT group had significantly longer durations of oxygen support (17.5 vs. 13.0 days, p = 0.001), hospitalization (20.0 vs. 14.0 days, p = 0.001), and ICU stay (5.0 vs. 1.0 days, p = 0.01).

Conclusions

Prolonged steroid therapy beyond 10 days did not improve survival or other clinical outcomes in patients with severe COVID-19, suggesting that early steroid withdrawal may be appropriate for selected patients.

Peer Review reports

Introduction

Cytokine dysregulation, resulting from uncontrolled replication of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and aberrant immunologic responses, is a primary factor in the development of acute respiratory distress syndrome in coronavirus disease 2019 (COVID-19) patients. Dexamethasone and other steroids, known for their anti-inflammatory effects, have therefore become key treatments for COVID-19 patients requiring oxygen support [1,2,3]. Unlike in COVID-19, steroid use in viral infections such as influenza and respiratory syncytial virus has shown no clear benefit [4,5,6], whereas in Pneumocystis jirovecii pneumonia, steroids help reduce inflammation and lung damage [7]. Despite mixed outcomes in non-COVID-19 pneumonia, the benefit of steroids in COVID-19 is well-established [3].

The Randomized Evaluation of COVID-19 Therapy (RECOVERY) trial revealed that 6 mg of dexamethasone daily for up to 10 days significantly reduced 28-day mortality in oxygen-requiring patients [3], supporting the current COVID-19 treatment guidelines [3, 8, 9]. However, the optimal duration of steroid therapy beyond 10 days remains undetermined and there is currently no definitive guidance on whether to abruptly cease or gradually taper dexamethasone in such patients. This decision often relies on the clinician’s judgment and the patient’s clinical progress.

Case reports have described rebound COVID-19 pneumonia following abrupt cessation of dexamethasone after 10 days [10, 11]. One study suggested that prolonged steroid use may prevent rebound COVID-19 pneumonia [12]. However, extended steroid use may increase the risk of bacterial or fungal infections [13,14,15]. Additionally, high doses of steroids have been associated with increased 28-day mortality and delayed SARS-CoV-2 clearance [16]. The decision to cease or taper steroids is a critical clinical consideration that can impact patient recovery. Considering conflicting evidence, this study aimed to compare clinical outcomes, specifically focusing on mortalities and the incidence of rebound pneumonia, between patients who discontinued steroids within 10 days and those who continued with tapering beyond 10 days.

Methods

Study setting and participants

This single-center, retrospective cohort study was conducted at a 2,800-bed tertiary hospital in Seoul, Republic of Korea. Adult patients (≥ 18 years) diagnosed with initial COVID-19 infection within 7 days of hospital admission between September 1, 2020 and May 31, 2022 were included. Eligible patients had World Health Organization Clinical Progression Scale (WHO-CPS) scores between 6 and 9 and received oxygen support via high-flow nasal cannula (HFNC), noninvasive ventilation (NIV), mechanical ventilation (MV), or extracorporeal membrane oxygenation (ECMO) [17]. COVID-19 diagnosis was confirmed via nasopharyngeal swab polymerase chain reaction (PCR) tests and all patients received 6 mg dexamethasone daily or equivalent for at least 5 days [18].

We excluded patients who had been taking ≥ 5 mg of oral prednisolone (or equivalent) for over 4 weeks [19] due to conditions such as rheumatologic or pulmonary diseases and solid organ transplantation. These patients were already on steroids before their COVID-19 infection and maintained steroid therapy after recovery, complicating the determination of tapering duration. Moreover, almost all these patients underwent steroid tapering, making comparisons between early withdrawal and prolonged tapering groups challenging. Additionally, we excluded patients with WHO-CPS scores < 6, those treated with steroids for < 5 days, or those who died within 10 days of admission.

Clinical information was collected from electronic medical records (EMRs) of all patients. This data included age, sex, body mass index, vaccination status against SARS-CoV-2, comorbidities, the severity of COVID-19 pneumonia, Sequential Organ Failure Assessment (SOFA) score, treatments, such as pronation, remdesivir, baricitinib, tocilizumab, and steroids, and laboratory results. During the study period, study participants received one of the following vaccines: Comirnaty® (Pfizer Inc., Manhattan, New York, United States), Spikevax® (Moderna Inc., Cambridge, Massachusetts, United States), or Vaxzevria™ (AstraZeneca plc., Cambridge, United Kingdom). Patients were classified based on their vaccination status as none or partially vaccinated (0–1 dose), fully vaccinated (2 doses), or boosted (≥ 3 doses). All identifiable information was anonymized before being accessed by the authors. Due to the retrospective design, informed consent from patients was waived. This study was approved by the institutional review board of Asan Medical Center (IRB No. 2022 − 1431).

During the study period, three variants of concern successively predominated in the Republic of Korea: Alpha (September 2020–July 2021), Delta (August 2021–January 2022), and Omicron (February 2022–May 2022) [20]. Patient variant exposure was categorized by these timeframes. Baricitinib and tocilizumab were approved for use on April 1, 2021 (Alpha-dominant period) and March 15, 2022 (Omicron-dominant period), respectively, and were included as matching variables to isolate the effect of steroids.

Clinical outcomes and definitions

Patients were divided into two groups: early withdrawal (EW, ≤ 10 days of steroid use without tapering) and prolonged tapering (PT, > 10 days with tapering), following the RECOVERY trial protocol [3]. The primary outcome was 28-day mortality. Secondary outcomes included 60-day mortality, aggravation (e.g., intubation after HFNC/NIV or ECMO after MV) following initial dexamethasone administration for 7–10 days, rebound pneumonia, infectious complications, steroid-induced hyperglycemia or psychiatric problems, emphysema or pneumothorax, readmission or emergency department (ED) revisits within three months after discharge, length of ICU stay or hospitalization, and duration of oxygen or MV support.

Rebound pneumonia was defined by: (i) initial clinical improvement with dexamethasone therapy; (ii) subsequent WHO-CPS increase or clinical worsening after steroid cessation/reduction; and (iii) no other bacterial, fungal, or viral infections confirmed by microbiologic examinations, such as respiratory specimen cultures and PCR tests [12, 21]. Infectious complications included all bacterial, fungal, or viral infections during or after steroid therapy. Steroid-induced hyperglycemia or psychiatric events were defined by at least one specialist consultation for glucose or symptom control 7–10 days after starting dexamethasone. Emphysema or pneumothorax was confirmed via chest X-ray or computed tomography (CT) in the same timeframe. Readmissions or ED revisits were defined as hospital returns due to dyspnea or pneumonia. Oxygen support duration was defined from the start of WHO-CPS ≥ 5 to recovery at WHO-CPS ≤ 4.

Statistical analysis

Continuous variables were presented as medians with interquartile ranges (IQRs) and were compared using the Mann–Whitney U test. Categorical variables were expressed as frequencies with percentages and were analyzed using chi-square or Fisher’s exact test, as appropriate.

To assess the effect of prolonged steroid therapy, Cox proportional hazards models and Kaplan-Meier curves were used to compare mortalities between the two groups after propensity score matching. The coxph() function with the cluster() option in R was used to adjust the clustering effects within matched pairs. The proportional hazards assumption was tested using Schoenfeld residuals for each predictor, confirming no significant violations.

Given potential selection bias (e.g., more severe patients receiving prolonged steroids), 1:1 propensity score matching was performed using the nearest-neighbor method with a caliper of 0.2 times the standard deviation of the logit of the propensity score. Confounding factors were identified via logistic regression and matching was conducted based on the calculated propensity scores. Matching variables included age, sex, comorbidities, SARS-CoV-2 variant period, vaccination status, specific laboratory results (e.g., elevated lactate dehydrogenase level or lymphopenia), treatments (e.g., pronation, remdesivir, baricitinib, or tocilizumab), oxygen support methods (e.g., HFNC, NIV, MV, or ECMO), and SOFA scores. Balance was assessed via standardized mean differences (< 0.10 considered acceptable). The effectiveness of the matching was further evaluated by comparing the baseline characteristics of the matched groups using chi-square or Fisher’s exact test for categorical variables and Mann–Whitney U test for continuous variables, as appropriate.

Outcomes were analyzed in the matched dataset, with hazard ratios (HRs) and 95% confidence intervals (CIs) reported for mortality. Time-to-event data were censored at the last follow-up date for those lost. Subgroup analyses were also performed based on the following stratifications: age (< 65 vs. ≥65 years), obesity, oxygen delivery method, SOFA score (< 4 vs. ≥4), and SARS-CoV-2 variant.

Univariate and multivariate Cox proportional hazards regression were conducted to identify risk factors for 28-day mortality. Similarly, univariate and multivariate logistic regression identified risk factors for rebound pneumonia. For predictive model development, variables with a p-value < 0.20 in univariate analysis were included in multivariate analyses. Backward elimination method was applied to refine the final model, retaining variables with p-values < 0.10.

All significance tests were two-sided, with p values of less than 0.05 considered statistically significant. Statistical analyses and graphic presentations were conducted using R Studio version 4.4.3 software (R Foundation for Statistical Computing, Vienna, Austria).

Results

Characteristics of the study participants

During the study period, 312 patients with severe COVID-19 were admitted. After excluding 65 patients (due to prior steroid use, short steroid course, or early death within 10 days of admission), 247 were eligible (Fig. 1). The baseline characteristics of these patients before matching are presented in Table 1. Following 1:1 propensity score matching, 68 patients from each group (EW and PT) were included in the final analysis (Fig. 1). Among the 136 matched patients, seven patients (all in the EW group) were lost to follow-up. Of them, four were lost before day 28 and three between days 29 and 60.

Fig. 1
figure 1

Flowchart of the study participants. Abbreviations: COVID-19, coronavirus disease 2019; WHO-CPS, World Health Organization-Clinical Progression Scale; n, number

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Significant differences in WHO-CPS scores, SOFA scores, pronation, and serum lactate dehydrogenase levels were balanced after matching (Table 1). The distributions of the propensity scores and standardized mean differences for the covariates before and after matching are presented in Table S1 and Fig. S1.

Among the 136 matched patients, 87 (64.0%) were male, with a median age of 65.0 years (IQR 52.5–73.0). More than half (52.9%) were diagnosed with COVID-19 infection during the delta variant-dominant period. Most (65.4%) received HFNC or NIV, while the remainder were supported by MV. Median SOFA score was 3.0 (IQR 2.0–6.0) and the median time from symptom onset to initial steroid use was 6.0 days (IQR 3.0–8.0). In the PT group, the median duration of the tapering periods was 13.0 days (IQR 7.0–21.0), with the median daily dose equivalent to 19.5 mg of methylprednisolone (IQR 14.6–25.0) (Table 1).

Table 1 Clinical characteristics of the study patients before and after propensity score matching
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Risk factors associated with In-Hospital 28-Day mortality and rebound pneumonia in patients with severe COVID-19

Univariate analysis of the matched severe COVID-19 cohort identified age, obesity, chronic kidney disease, solid malignancy, hematologic malignancy, SOFA score, and D-dimer level as potential predictors associated with 28-day mortality. Subsequent multivariate analysis using backward elimination produced a refined model that included age (adjusted HR (aHR) 1.08, 95% CI 1.02–1.15, p = 0.01), solid malignancy (aHR 8.87, 95% CI 2.44–32.20, p < 0.01), and hematologic malignancy (aHR 13.09, 95% CI 1.33–128.72, p = 0.03) as significant predictors of 28-day mortality (Table 2).

Additionally, univariate analysis for rebound pneumonia identified age, obesity, chronic kidney disease, solid malignancy, mechanical ventilation (WHO-CPS 7–9), pronation, D-dimer level, and use of remdesivir as potential predictors. Multivariate analysis with backward elimination yielded a refined model comprising obesity (adjusted odds ratio (aOR) 0.20, 95% CI 0.05–0.81, p = 0.02), chronic kidney disease (aOR 4.27, 95% CI 0.91-20.00, p = 0.07), solid malignancy (aOR 7.24, 95% CI 1.19–44.18, p = 0.03), mechanical ventilation (aOR 4.24, 95% CI 1.09–16.53, p = 0.04), and remdesivir use (aOR 0.20, 95% CI 0.04–0.90, p = 0.04). Table S2 presents the results from logistic regression on rebound pneumonia.

Table 2 Risk factors associated with 28-day mortality in the matched patients with severe COVID-19
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Effects of prolonged steroid therapy on clinical outcomes

Before matching, no significant differences were observed between the groups regarding in-hospital 28-day mortality, aggravation rate, readmission or ED revisits within three months after discharge, the incidence of rebound pneumonia, and steroid-induced hyperglycemia or psychiatric problems. However, 60-day mortality and the incidence of infectious complications were significantly higher in the PT group than in the EW group, with rates of 19.9% vs. 7.2% (p = 0.01) and 17.6% vs. 8.1% (p = 0.04), respectively (Table 3).

After matching, no significant differences were observed in 28-day and 60-day mortalities, aggravation rate, readmission/ED revisits, rebound pneumonia, infections, and steroid-induced complications (Table 3). Cox regression analyses revealed no significant differences in 28-day mortality (HR 0.54, 95% CI 0.16–1.84, p = 0.32) or 60-day mortality (HR 1.22, 95% CI 0.48–3.10, p = 0.67) between the groups. Kaplan-Meier curves for these results are presented in Fig. 2. Table S3 presents the results of subgroup analyses for factors such as age, obesity, oxygenation methods, SOFA scores, and SARS-CoV-2 variants. It similarly showed that prolonged steroid use was not significantly associated with 28-day and 60-day mortalities, consistent with the main analysis findings.

Fig. 2
figure 2

Survival analysis according to steroid tapering in patients with critical COVID-19. (A) 28-day mortality. (B) 60-day mortality

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The lengths of hospitalization, ICU stays, and oxygen support were significantly longer in the PT group compared to the EW group, regardless of the matching process. Additionally, the incidence of emphysema or pneumothorax was significantly higher in the PT group than in the EW group, also irrespective of the matching process. Before matching, the duration of MV support was significantly longer in the PT group. However, after matching, there was no significant difference in this outcome between the two groups (Table 3).

Table 3 Clinical outcomes for the study patients before and after 1:1 propensity score matching
Full size table

Discussion

This study examined patients with severe COVID-19 who received oxygen support via HFNC, NIV, MV, or ECMO and who had SOFA scores 2.0–6.0. We found that prolonged steroid use beyond 10 days did not significantly reduce 28-day or 60-day mortality. Early steroid withdrawal without tapering was also not associated with increased rebound pneumonia, readmission, or ED revisit. Multivariable analysis showed consistent results, indicating no significant association between prolonged steroid therapy and reduced mortality. These findings provide valuable insights into the clinical management of severe COVID-19, especially regarding the optimal duration of steroid therapy.

Our findings align with previous studies that reported limited survival benefits from extended steroid therapy. A meta-analysis of seven randomized clinical trials and twenty observational studies showed no additional survival benefit beyond 6–7 days of steroid use [22]. Another retrospective study revealed that prolonged steroids (> 10 days) significantly increased in-hospital mortality and infectious complications [23]. Although our study did not show a significant association between prolonged steroid use and mortality or infection rates, overall mortality in that study was higher (35.9%) compared to our study (13.2%) [23]. This discrepancy may stem from the higher proportion of mechanically ventilated patients in the previous study and the inclusion of Omicron variant cases in our study, which are generally less severe than Delta infections [24].

However, most of our cohort was admitted during the Delta wave, with only 8.8% from the Omicron period. Notably, after matching, the severity of patients in the matched PT group was significantly reduced. In this group, over 60% of patients required only HFNC or NIV, rather than MV. Furthermore, the median SOFA score was 3.0 (IQR 2.0–6.0) and only 8.8% of patients underwent pronation. Therefore, the observed lack of benefit from prolonged steroid therapy may apply primarily to patients with less severe critical illness, such as those with SOFA scores below 6.0 or without acute respiratory distress syndrome. The impact of prolonged steroid therapy on mortality in more critically ill patients cannot be conclusively determined from our study.

Aggravated cases were limited to just two cases, with one in each treatment group. No significant differences were observed in the clinical aggravation or duration of MV support. These findings are consistent with a randomized controlled trial of patients with COVID-19 requiring low-flow oxygen, HFNC, or NIV, which showed no significant differences in tracheostomy (2.4% vs. 2.6%, p = 0.82), ICU referral (12.2% vs. 13.2%, p = 0.68), and MV-free days at day 28 (28.0 vs. 28.0, p = 0.92) between prolonged methylprednisolone treatment and early dexamethasone withdrawal groups [25]. Thus, the effect of prolonged steroid therapy on clinical deterioration and prognosis in critical COVID-19 pneumonia remains uncertain. However, this effect might have been underestimated due to the lower severity of matched patients. In patients with higher SOFA scores and more critical illness, the impact of prolonged steroid therapy may differ.

A retrospective study of COVID-19 patients infected with the Omicron variant found that prolonged high-dose steroid therapy significantly reduced overall mortality in those requiring HFNC, NIV, MV, or ECMO [26]. However, this study had a notably higher mortality rate (47.1%) compared to our study (14.2%), which may have exaggerated the perceived benefit of steroids. Interestingly, although our cohort included more patients requiring MV (34.6% vs. 17.6%), our mortality rate was lower. This discrepancy may be partly explained by the significantly lower use of remdesivir in that study (45.2% vs. 91.2%), as remdesivir has been associated with improved outcomes in severe COVID-19 pneumonia [27].

Durations of oxygen support, hospitalization, and ICU stay were all significantly longer in the PT group than in the EW group. This may be attributed to longer steroid treatment durations in the PT group, which were individualized based on clinical responses. Despite propensity score matching, more severe patients may have been included in the PT group, leading to longer oxygen support and ICU care. Additionally, the incidence of emphysema or pneumothorax was significantly higher in the PT group, potentially reflecting the inclusion of patients requiring longer or more intensive respiratory support [28, 29].

We found no significant association between prolonged steroid use and rebound pneumonia. A prior study reported that age, oxygen requirements, lymphopenia, and elevated soluble IL-2 receptor levels were predictive of rebound pneumonia, while steroid duration and timing were not significantly different between patients with and without rebound phenomena [21]. Another study suggested that early initiation and abrupt cessation of steroids may trigger rebound events [12]. We conducted univariate and multivariate analyses to identify risk factors for rebound pneumonia. The final refined model included obesity, chronic kidney disease, solid malignancy, mechanical ventilation, and remdesivir use. Notably, remdesivir use was significantly associated with a reduced risk of rebound phenomena. Remdesivir may mitigate viral replication and reduce viral loads, thereby decreasing the likelihood of rebound pneumonia, consistent with previous findings [30]. Therefore, prolonged steroid use may not effectively prevent rebound phenomena in severe COVID-19 patients, as rebound may be more strongly influenced by factors beyond inflammation, such as increased viral loads and impaired immune responses [30, 31].

Long-term systemic steroid use may increase the risk of bacterial and fungal infections [32, 33]. Before propensity score matching, the PT group had a significantly higher rate of infectious complications, which became nonsignificant after matching. The higher WHO-CPS and SOFA scores in the PT group before matching suggest that the increased rate of infections could be attributed to the severity of the disease. Thus, infectious complications may reflect not only prolonged steroid use but also the underlying severity of illness [34]. Similarly, there were no significant differences between groups in other steroid-induced adverse events, such as hyperglycemia and psychiatric problems. These events may also be related to illness severity and extended ICU stays, in addition to prolonged steroid administration [35, 36].

Our study provides important insights into managing severe COVID-19 patients requiring oxygen support. Specifically, patients with SOFA scores of 2.0 to 6.0 who required oxygen through HFNC, NIV, or MV may not benefit from steroid therapy beyond 10 days. However, several limitations should be considered. First, the retrospective, single-center design and small sample size may limit generalizability and may introduce selection bias. Although no significant differences were observed between the groups, the study may have been underpowered to detect modest effects due to the small sample size, as reflected in the wide confidence intervals. Moreover, though matching was used, unmeasured or residual confounding may remain. Second, we excluded patients previously on steroids, which precludes an analysis of prolonged steroid therapy effects on immunocompromised patients who have undergone solid organ or hematopoietic stem cell transplantation. Third, seven patients were lost to follow-up (all in the EW group), which may introduce bias despite censoring in survival analysis. Fourth, our cohort excluded patients on low-flow oxygen, as few of these received prolonged steroid therapy. Fifth, although we used the criteria from the previous studies to define rebound pneumonia, the diagnosis relied on subjective clinical judgment and may be prone to misclassification. However, we endeavored to distinguish these conditions using microbiological studies, providing more objective evidence for classification. Lastly, not all patients underwent chest CT or had their imaging reviewed, raising the possibility that steroid-responsive conditions like organizing pneumonia were underrepresented [37, 38]. However, as most cases of organizing pneumonia occur 2–3 weeks after symptom onset [37,38,39] and the median time to steroid initiation in our cohort was 6 days, the likelihood of widespread inclusion of such cases is low. Furthermore, the absence of significant differences in readmissions or ED revisits after discharge supports this conclusion. To better establish the optimal duration of steroid treatment in patients with severe COVID-19, further randomized controlled trials with larger, more diverse cohorts and comprehensive chest imaging reviews are necessary.

Conclusions

In patients with severe COVID-19 requiring HFNC, NIV, or MV and SOFA scores between 2.0 and 6.0, prolonged steroid therapy beyond 10 days did not improve 28-day or 60-day mortality, the incidence of rebound pneumonia, or the rate of readmission or ED revisits. These findings suggest that extended steroid use with tapering may be unnecessary in similarly severe cases.

Data availability

J. H. and E. C. had full access to data for the study and were responsible for the integrity of the data and the accuracy of analyses. The data that support the findings of this study are not openly available due to reasons of sensitivity.

Abbreviations

SARS-CoV-2:

Severe acute respiratory syndrome coronavirus 2

COVID-19:

Coronavirus disease 2019

RECOVERY:

Randomized Evaluation of COVID-19 Therapy

WHO-CPS:

World Health Organization Clinical Progression Scale

HFNC:

High-flow nasal cannula

NIV:

Noninvasive ventilation

MV:

Mechanical ventilation

ECMO:

Extracorporeal membrane oxygenation

PCR:

Polymerase chain reaction

EMR:

Electronic medical record, SOFA, sequential organ failure assessment

ED:

Emergency department

IQR:

Interquartile range

HR:

Hazard ratio

CI:

Confidence interval

CT:

Computed tomography

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Acknowledgements

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Funding

This study was supported by a grant from the National Research Foundation of Korea from the Ministry of Science and ICT, South Korea (grant number RS-2023-00219002).

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Authors and Affiliations

  1. Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea

    Jaijun Han, Seongman Bae, Jiwon Jung, Min Jae Kim, Yong Pil Chong, Sang-Ho Choi, Sang-Oh Lee, Yang Soo Kim, Euijin Chang & Sung-Han Kim

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  1. Jaijun Han
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Contributions

Concept and Design: E. C., S. K. Acquisition, analysis, or interpretation of data: J. H., E. C. Drafting of manuscript: J. H., E. C. Critical revision of the manuscript for important intellectual content: S. B., J. J., M. J. K., Y. P. C., S. C., S. L., Y. S. K., E. C., S. K. Statistical analyses: J. H., E. C. Obtained funding: S. K. Administrative, technical or material support: E. C., S. K. Supervision: E. C., S. K.

Corresponding author

Correspondence to Euijin Chang.

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Ethics approval and consent to participate

This retrospective cohort study received approval from the institutional review board of the Asan Medical Center (IRB No. 2022 − 1431) and its ethics committee. No personalized information of patients was exposed and no direct contact were made. The ethics committee waived determined that it was unnecessary to obtain informed consent due to the retrospective nature of this study.

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Han, J., Bae, S., Jung, J. et al. The clinical impact of prolonged steroid therapy in severe COVID-19 patients: a retrospective cohort study with propensity score matching. BMC Pulm Med 25, 222 (2025). https://doiorg.publicaciones.saludcastillayleon.es/10.1186/s12890-025-03674-1

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Keywords

BMC Pulmonary Medicine

ISSN: 1471-2466

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