Study on Influence of Diabetes Mellitus for the Charged Cost and Length of Stay among the Angina Pectoris Patient in Japan

In order to clarify the importance of diabetes control, the authors examine the impact of diabetes mellitus on resource consumption among the angina pectoris patient institutionalized in the Japanese acute hospitals. We used the 2009 DPC database. The DPC database is a discharge summary and administrative claims database that represents approximately 50% inpatient admissions to acute care hospitals in Japan. Among 2,553,283 acute in-patient cases of 855 hospitals, we extracted 115,868 patients with the diagnosis of angina pectoris (DPC code with six digits=050050). Based on this dataset, we compared the resource consumption measured by length of stay and charged cost between the angina pectoris patients with diabetes and those without diabetes. The diabetic patients showed lower mean ages (male: 68.1 vs. 67.2, female: 73.0 vs. 71.4), longer length of stay (male: 6.4 vs. 6.9, female: 7.6 vs. 8.3), higher charged cost (male: 140,314.0 vs.145,206.9, female: 143,305.1 vs. 149,252.1; 1 point = 10 JPY) and higher CCI (male: 1.3 vs. 1.6, female: 1.3 vs.1.5) with statistical significances. Furthermore, there was a wide regional variation among the diabetes prevalence among the observed population. The present analysis has clarified that diabetes increase the resource consumption among the angina pectoris patients. In order to control the health expenditures and ameliorate the population’s health status, the preventive activity of diabetes must be put more emphasis.