All workers have the right to perform their job duties under the best possible conditions, safeguarded from the harm which the execution of their duties may entail. In addition, employers have the obligation to guarantee this right to health, implementing a preventive system which assures the safety and health of the workers under their charge. Information for workers is a fundamental part of any occupational health and safety management system in companies. The aim of this study was to analyze the influence in which preventive information has on certain variables relating to workers' occupational health and safety and by sector of activity. This study was conducted with data collected through the 6th National Survey on Working Conditions in 2007 in Spain. The data included a random sample of 11,054 people from a working population of 20,476,900. To conduct the study a probabilistic model was created using Bayesian networks including the following variables: preventive information, sector, psychological symptoms, physical symptoms and accidents at work. The results indicated the importance of information in companies' preventive activity and the difference existing in its application across the various sectors, with Industry being the sector in which information for workers has the most positive impact. (Contains 5 tables and 3 figures.)