['To examine the relationship between sustained work with quality improvement (QI) and factors related to research utilization in a group of nurses.', 'The study was designed as a comparative survey that included 220 nurses from various health care organizations in Sweden. These nurses had participated in uniformly designed 4-day basic training courses to manage a method for QI.', 'A validated questionnaire covering different aspects of research utilization was employed. The response rate was 70% (154 of 220). Nurses in managerial positions at the departmental level were excluded. Therefore, the final sample consisted of 119 respondents. Four years after the training courses, 39% were still involved in audit-related activities, while 61% reported that they had discontinued the QI work (missing = 1).', 'Most nurses (80-90%) had a positive attitude to research. Those who had continued the QI work over a 4-year period reported more activity in searching research literature compared with those who had discontinued the QI work (P = 0.005). The QI-sustainable nurses also reported more frequent participation in research-related activities, particularly in implementing specific research findings in practice (P = 0.001). Some contextual differences were reported: the QI-sustainable nurses were more likely to obtain support from their chief executive (P = 0.001), consultation from a skilled researcher (P = 0.005) and statistical support (P = 0.001). Within the broader health care organization, the existence of a research committee and a research and development strategy, as well as access to research assistant staff, had a tendency to be more common for nurses who had continued the QI work.'] Does sustainability in changing clinical practice promote evidence-based nursing care?