The more specialized and advanced the world of medicine has been, and the more its professionalism, has been required for the role of nurses and the autonomy of nurses has been discussed as an issue to acquire. In this study, we translate "Nursing Activity Scale (NAS)" (1992) into Japanese and verified its reliability and validity. 1. A survey in which the Japanese version of NAS (1992) was conducted upon 400 nurses who work at Japanese average size hospitals. The results are as follows; Pearson's correlation coefficient is 0.68, Cronbach's α is 0.86 in the first and 0.83 in the second test, and the correlation coefficient in the split-half method marks 0.80 in the first and 0.78 in the second test. Thus we can see the strong reliability. As concerns of the validity, we can see the correlation in the level of person's satisfaction on his/her profession as the criterion-related validity, and there is a significant probability by difference of the position at work as concurrent validity (p<0.01). 2. To measure the construct validity, we had 940 nurses who work at four different public hospitals in Japan to join the survey and analyzed the factors on NAS for the first time. As the results, we extract five factors and label each of them as 'taking a new action as nurse specialists,' 'developing an activity as nurse specialists,' 'judgment based on consciousness of nurse specialists,' 'responsibility as nurse specialists,' and 'improvement in activities as nurse specialists.' In addition to that, there is a probability between the total points of NAS and all elements, and the correlation was seen. Thus we may say that the Japanese version of NAS (1992) is valid as a criterion to measure the professional autonomy of nurses.
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