The purpose of this study is to estimate the proper number of the care staffs in the nursing home scientifically and experimentally, based on a kind of the simulation analysis using the time-study survey data. By means of the following procedure, we examined what care was done in a certain care system for 25 severely disabled aged residents. (1) decide the standard daily tasks, each rate of the required time allocated "main care", "other care", and "administration", and the rules of job performance, in order to set up the operational model of the care system. (2) give the time required for each care behavior and the changeable variable, "the number of the care staffs", in order to simulate the given model, and then observe what changes happen in the care system as the number of care staffs changes. As of a result, it was suggested that the existing care system, in which one staff took care of 4.5 residents, was quite insufficient. We presumed that to 2.1-2.5 residents at least one care staff is necessary to secure their quality of life.
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