Abstract
The purposes of this research are to disclose and to generalize the actual conditions of the factors that prolong LOS (Length of Stay) with the data from several hospitals. In this research, the factors in difference in average LOS are extracted and the significant differences are inspected in order to make multiple regression analysis. As a result of the general analysis, it is found out that LOS of the patients who change the department is 15 days longer than that of the patients who don't. Moreover, as a patient gets older by one year, LOS also gets longer by about 0.1 day. As a result of multiple regression analysis classified under MDC, complications post hospitalization affects neurological disease while complications pre hospitalization does respiratory organs disease, digestive organs disease, skin disease and so on. Changing the department affects otolaryngological disease and skin disease a lot while age of patients does respiratory organs disease a lot. Therefore it is presumed that each disease is related to the difference in the incidence of complications pre hospitalization and complications post hospitalization, the difference in LOS on which complications has an in.uence, the incidence of changing the department, and the patients' age.
