Abstract
The value of the neutrophil-to-lymphocyte ratio (NLR) in predicting outcomes in patients hospitalised with community-acquired pneumonia (CAP) remains debated. This study evaluated whether NLR independently predicts clinical outcomes and enhances the predictive performance of the CURB-65 score in patients with CAP. Data from CAP admissions at two Australian hospitals from 2018 to 2023 were analysed. NLR was calculated using admission neutrophil and lymphocyte counts. Patients were categorised into NLR >12 and NLR ≤12. Multilevel-multivariable regression models, adjusting for age, sex, Charlson index, CURB-65 score, Hospital Frailty Risk Score (HFRS) and C-reactive protein (CRP), assessed outcomes including length of stay (LOS), intensive care unit (ICU) admission and in-hospital mortality. Over 6 years, 7,862 patients with CAP were hospitalised (mean age 75.1 years, 54.6% male). Mean NLR was 12.6, with 2,877 (36.6%) patients having an NLR >12. Those with NLR >12 were older males with higher disease severity and Charlson index (p<0.05). Adjusted analyses showed that NLR >12 was independently associated with prolonged LOS (IRR=1.11, 95% CI 1.08-1.13, p<0.001), increased risk of ICU admission (adjusted odds ratio (aOR) =1.41, 95% confidence interval (CI) 1.06-1.88, p=0.019), and higher in-hospital mortality (aOR=1.27, 95% CI 1.06-1.53, p=0.009). The predictive ability of the CURB-65 score for in-hospital mortality was good (area under the curve (AUC) 0.68, 95% CI 0.66-0.70), while it was modest for the NLR (AUC 0.58, 95% CI 0.56-0.60). Incorporation of NLR to the CURB-65 score did not enhance its predictive ability (AUC 0.69, p>0.05). NLR independently predicts adverse outcomes in patients hospitalised with CAP but does not improve the predictive performance of the CURB-65 score.
Published Version
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