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Diabetes Affects Length of Stay and Hospital Costs for Elderly Patients with Pneumonia: An Analysis of a Hospital Administrative Database.

OBJECTIVE
The present study investigated the association of having diabetes with length of stay and hospital costs for elderly patients with pneumonia who were admitted to an acute-care hospital in Japan.


METHODS
Based on the inpatient administrative claims database of an acute-care hospital in central Tokyo between 2010 and 2013, 753 patients aged ≥ 65 years who were admitted to the hospital presenting with pneumonia and discharged alive were analyzed. The association was analyzed using a negative binomial model, having adjusted for age, sex, body mass index, dyspnea grade, functional evaluation of feeding, use of mechanical ventilation, and use of renal replacement therapy. A log-linear regression model adjusted for the same variables was used in the analysis of hospital costs.


RESULTS
Of the 753 patients (mean age, 82.5 years; men, 58.2%), 225 patients had diabetes. The negative binomial regression revealed that those with diabetes had a 1.19 times longer length of stay (95% CI = 1.06-1.33) compared to those without. The log-linear regression revealed that hospital costs were 1.14 times higher (95% CI = 1.04-1.25) in patients with diabetes.


CONCLUSION
The presence of diabetes significantly correlated with longer length of stay and higher hospital costs for elderly patients with pneumonia.